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Discover the genius engineering hidden in everyday items that many toss aside! This deep-dive reveals how professionals find valuable parts in discarded electronics while exposing the clever designs intended to solve real-life challenges. Learn to appreciate the overlooked functionality in your household objects and embrace a more sustainable lifestyle. Join us as we unveil the most astonishing hidden features that can transform your perspective on waste!
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00:00:00Leaving your valuables or a chocolate bar in a car is a no-brainer.
00:00:04But there are other things people often overlook.
00:00:08Here's what to watch out for before leaving your car.
00:00:11Number 1 is aerosol cans.
00:00:14Hairspray, deodorant, spray paint, household cleaner and that sort.
00:00:18On the back of these cans, you might notice a storage temperature recommendation.
00:00:22Well, stick to that.
00:00:24Here's what can happen.
00:00:26Since these cans are pressurized, they become more sensitive to temperature.
00:00:31What's inside the aerosol may expand and this may result in a crack and then the can can blow up.
00:00:37Temperatures above 100 degrees Fahrenheit are already alarming and it can easily get as hot as that in your car
00:00:44on a warm summer day.
00:00:46Researchers from the USA have figured out how long it takes a car to turn into a sweat factory on
00:00:52a hot day.
00:00:56Within 1 hour, the insides of the car parked in the sun reaches 95 degrees Fahrenheit or hotter, with an
00:01:03average temperature of 116 degrees Fahrenheit.
00:01:07So, if you want your car in one piece and running, take aerosol cans with you.
00:01:14The second item is sunscreen.
00:01:18Sunscreen is vital for your skin since it decreases the risk of skin complications and prevents skin aging caused by
00:01:24the sun.
00:01:26This includes wrinkles, sagging and age spots.
00:01:30But when you leave sunscreen in your car, it gets exposed to high temperatures and it can ultimately shorten its
00:01:36shelf life.
00:01:36If you end up finding spoiled sunscreen, you might notice a funny smell when you open the cap.
00:01:42Plus, the heat might cause the cap to open and the sticky substance will get all over the car.
00:01:48The same rule applies to lipsticks and other cosmetics as well.
00:01:53The next one is plastic bottles.
00:01:57There are two reasons why you shouldn't leave them inside your car.
00:02:00Firstly, a plastic water bottle can act as a lens, magnifying the sun's rays and starting a fire.
00:02:08A fire department in Oklahoma conducted an experiment and confirmed that the danger of fire was real.
00:02:15David Richardson from that department says it can happen if the beam of light is focused enough.
00:02:21The second reason is related to your health.
00:02:23Many plastic bottles contained by sphenol, a potentially toxic compound.
00:02:28The BPA levels can increase at high temperatures and that can be harmful to your body.
00:02:34There's a chance that this chemical can get into your drink after you leave the bottle inside the vehicle.
00:02:41Oh, and batteries.
00:02:42They could lose their capacity to work at full power when they're left abandoned in the car.
00:02:47You can buy a new pair and fix this problem, but it won't be as easy to solve the problem
00:02:52of leakage or a rupture.
00:02:54It can be bad for your health because battery acid is dangerous when inhaled and highly corrosive.
00:03:01The reason for leakage is again related to high temperatures.
00:03:05Battery manufacturers recommend keeping their products at room temperature.
00:03:11This fact is partially related to batteries.
00:03:13It's about electronics.
00:03:15Have you ever realized how hot your phone can get when it's exposed to the sun?
00:03:20You're driving and, let's say, looking at the GPS on your phone.
00:03:24Even in this situation, your phone can heat up.
00:03:27What will happen to it after hours of sun exposure?
00:03:31Phone companies are strongly against customers leaving their devices in vehicles
00:03:35because they might shut down, get damaged, or, you know, boom!
00:03:41Personal belongings are another priority on the list.
00:03:44A wallet or a handbag may come to one's mind first.
00:03:48Yet, a passport or even some change you leave near the passenger seat is sometimes enough to attract a thief.
00:03:55Better to keep such stuff out of sight, for example, by storing it in the trunk instead of leaving it
00:04:01in the back seat.
00:04:04Number 7 is also related to theft.
00:04:06Life can be too hectic sometimes.
00:04:09And it's understandable if you can't clean your car frequently.
00:04:12But leaving garbage in the car is another mistake.
00:04:15Thieves tend to search for messy-looking cars.
00:04:18They think that the owner doesn't use such a vehicle frequently.
00:04:23How about plants?
00:04:26I know it isn't that common to keep plants in the car on a daily basis, but sometimes you need
00:04:32to move them.
00:04:32The heat inside the vehicle can easily dehydrate the poor thing.
00:04:38Medications are another thing you shouldn't keep in the car for too long.
00:04:42The constantly changing temperatures inside the vehicle can decrease the effectiveness of your pills.
00:04:48Authorities recommend keeping most medications at 59 to 77 degrees Fahrenheit in a cool and dry place.
00:04:57Important documents that contain your personal data shouldn't be left in the vehicle either.
00:05:02Some examples of such documents are tax forms, financial statements, and school transcripts.
00:05:08A thief could commit fraud or identity theft using this valuable information.
00:05:14And there's also food and drinks.
00:05:17Experts recommend not leaving groceries or leftovers in a warm car for more than two hours,
00:05:22or only an hour when it's over 90 degrees Fahrenheit.
00:05:26The same rule applies in the winter too.
00:05:29Canned foods, for example, have a high risk of going bad if a can of sweet peas, let's say, gets
00:05:36frozen in the car.
00:05:37The effect will be similar to what would happen to soda.
00:05:40Let it thaw in the refrigerator instead of leaving it at room temperature.
00:05:44If the product doesn't look or smell normal, throw it away in a place where not even an animal can
00:05:50find it.
00:05:51Don't try to taste it, just trust your senses.
00:05:54If the item seems rusted or there are some cracks in the can, it should end up in the trash
00:05:59too.
00:06:00Eggs are another example.
00:06:02Normally, eggs shouldn't be frozen.
00:06:05But let's suppose you forgot one grocery bag in the trunk of the car,
00:06:08and the weather was so cold at night that the eggs got frozen.
00:06:11Keep the eggs in the refrigerator before use.
00:06:14They should be hard cooked.
00:06:16It's your only option.
00:06:17You see, freezing causes the yolk to become thick and syrup-like.
00:06:21It loses that natural flow and doesn't mix well with other ingredients.
00:06:28You shouldn't leave your pets alone in the car, obviously.
00:06:31And not just because of a potential rise in temperature.
00:06:34They will feel uncomfortable without you, their best friend accompanying them.
00:06:39In their frustration, they might do something to get noticed,
00:06:42which can be, for example, ruining the interior of the vehicle.
00:06:48Now let's return to the winter season again.
00:06:50If possible, keep the gas tank of your car over half full.
00:06:54This can prevent the fuel lines from freezing.
00:06:56It also makes it easier to start the engine and hit the road in the morning.
00:07:00While keeping an eye on the fuel bar, it might be a good idea to glance at the tire pressure
00:07:05too.
00:07:06The cold can result in tire pressure drops.
00:07:11Not only high, but also low temperatures can damage some items.
00:07:15A good example is paint cans.
00:07:17They should be quickly taken out of the vehicle in the winter.
00:07:21The ingredients in the paint can experience expansion, separation, and clumping due to the cold.
00:07:27In other words, you won't be able to use this paint anymore.
00:07:32Weather also affects wooden musical instruments like violins or guitars.
00:07:37Changes in temperature and humidity can cause wooden instruments to warp, crack, or split.
00:07:44Glasses get affected by fluctuating temperatures too.
00:07:48In a hot car, plastic frames can bend.
00:07:50Or plastic can become brittle when it's very cold.
00:07:54This makes glasses prone to breaking.
00:07:57Don't leave house keys and garage door openers inside the car.
00:08:01This is an everyday practice for many people, but it's risky.
00:08:04They can get into the wrong hands.
00:08:08To listen to music, most people connect their phones to the car or listen to the radio.
00:08:13CDs are getting less and less used these days, but don't leave them in the car anyway.
00:08:18They might get warped, and you won't be able to use them anymore.
00:08:22Can you think of any other items you shouldn't leave in the car?
00:08:28What's hiding inside Coca-Cola cans and regular household batteries?
00:08:32Why do magnets affect breakfast cereals?
00:08:35Do crosswalk buttons actually work, or are they just useless decorations?
00:08:41What does that USB symbol really mean?
00:08:44I'm not sure I know the answers to these and similar questions,
00:08:49but I'm eager to learn the truth together with you.
00:08:51Let's find it out.
00:08:53Coca-Cola cans have a secret few people know about.
00:08:57Here's a Coke can.
00:08:59Let's submerge it in a highly corrosive alkaline solution.
00:09:02The aluminum dissolves due to a process known as hydrolysis,
00:09:06and we can see a plastic liner inside the can.
00:09:09It's made from a polymer or epoxy resin,
00:09:12and serves as some kind of a protective barrier between the aluminum walls of the can and the rather acidic
00:09:18soda.
00:09:20Despite a popular myth, household batteries don't actually contain liquid,
00:09:25and if you accidentally cut them open, no toxic liquid will spill.
00:09:29Most of them are dry cell batteries, which are made of electrochemical cells.
00:09:33Those convert chemical energy into electrical energy.
00:09:37Larger batteries often house numerous small cells within them, too.
00:09:42Even Tesla vehicle batteries consist of multiple small cells.
00:09:45When combined, they easily provide the necessary voltage.
00:09:51Most toothbrushes have differently colored bristles, but they aren't just pleasing to the eye.
00:09:56Those bristles, often blue, have a functional purpose.
00:10:00They're called toothbrush indicators, and their colors fade as you use the brush.
00:10:04The American Dental Association recommends changing your toothbrush at least four times a year.
00:10:09And by getting paler, these bristles help you figure out when it's time to replace your toothbrush.
00:10:16You'll probably agree that there's no better snack than a pack of chips.
00:10:20Some are flat, others have ridges.
00:10:22Is it just aesthetics?
00:10:24Not really.
00:10:26The main purpose of those lines on some kinds of chips is to help with the distribution of spices and
00:10:31seasonings.
00:10:31In other words, all those substances that make your chips taste like cheese are mostly stored inside the lines.
00:10:37Plus, the lines make chips crunchier.
00:10:42Now, this one might be a surprise, but some breakfast cereals are magnetic.
00:10:46That's because they're often fortified with iron in the form of a fine powder.
00:10:51Due to the added iron, cereal flakes get attracted to magnets.
00:10:55All this may sound kinda alarming, but in reality, the iron content in the flakes is minimal and doesn't pose
00:11:01any threat to your health.
00:11:04That clear fluid in gel pens is called the ink follower or stopper fluid.
00:11:09The gel in such pens contains pigment particles dissolved in a polymer solution.
00:11:14The main task of the stopper fluid is to be a barrier to prevent the gel from evaporating or leaking
00:11:19out.
00:11:20Without this transparent fluid, your gel pen wouldn't function.
00:11:25The fluid always stays in one position and doesn't get dissolved with the gel.
00:11:29Neither does it move backwards or flow out of the pen.
00:11:34Many pedestrian crosswalk buttons, namely in New York, are placebo buttons.
00:11:39They do literally nothing when you press them.
00:11:42Originally, they were functional after being introduced in 1964, but today, most of them don't affect traffic lights,
00:11:49which are programmed based on the real needs of the traffic flow.
00:11:53Why do such buttons even exist, then?
00:11:55It's a simple psychological trick, providing you with an illusion of control.
00:12:01You might have noticed that movie theater seats are almost always red.
00:12:06This choice isn't random.
00:12:08It has strategic importance, which is rooted in visual science.
00:12:12The thing is, red light has a longer wavelength.
00:12:15It means that it's the first color to disappear in low light.
00:12:18It allows the audience to concentrate better on the screen once the movie begins.
00:12:22Such a design choice enhances the viewing experience by minimizing distractions.
00:12:28Speed bumps are crucial for pedestrian safety.
00:12:31But at the same time, they can seriously increase car emissions due to the non-stop acceleration and deceleration they
00:12:38cause.
00:12:40To address this issue, some cities, like London, are testing fake speed bumps.
00:12:45Those are optical illusions painted on the road.
00:12:47They look raised from a driver's perspective, but in reality, they're flat.
00:12:52Authorities hope that this approach will slow down drivers without having a negative impact on the environment.
00:13:00Soda bottles are always filled in such a way that there's some space between the liquid and the cap.
00:13:06That's because soda contains carbon dioxide.
00:13:08It's a gas that can expand once the bottle's heated.
00:13:11If there's no gap in the bottle, it can break because of the pressure building inside.
00:13:17Also, when you open your drink, the gases go out in the form of bubbles, making the drink overflow.
00:13:23The gap helps with this problem, too.
00:13:27The USB symbol, looking like a trident, has always sparked multiple speculations about its origin.
00:13:34One popular idea is that it represents Neptune's trident and symbolizes power and adaptability.
00:13:40But there's also a little bit less exciting theory.
00:13:44A man who claimed to have designed the symbol in the 1980s stated that it was supposed to represent connectivity.
00:13:50The large circle symbolizes a computer, while the attached shapes, the circle, the triangle, and square, stand for different outputs.
00:14:00The design of a tennis racket has a specific feature known as the throat.
00:14:05It's an open space below the head of the racket.
00:14:08This space isn't just for storing balls.
00:14:11It also improves the racket's aerodynamics by letting air pass through.
00:14:15It seriously reduces drag during swings.
00:14:20Speaking of tennis, tennis courts are usually built with a north-south orientation.
00:14:25It helps minimize the impact of the sun's position during the game, ensuring that neither player has the sun directly
00:14:31in their eyes.
00:14:33Look closely at a tram's overhead lines, and you'll see that its contact wires zigzag back and forth instead of
00:14:40going in a straight line.
00:14:41That's because all trams have pantographs attached to their roofs.
00:14:46The upper part of the pantograph is gradually worn down by the overhead wire and eventually needs to be replaced.
00:14:53To wear it down evenly, the wire is not installed strictly along the tram's path, but in zigzag patterns.
00:15:01As the tram moves, the pantograph slides along the wire, and it wears down evenly.
00:15:08Those cone-shaped water cooler cups?
00:15:11Their shape is intentionally designed to prevent users from setting the cups down.
00:15:15This allows employees to minimize the risk of spilling water on their desks around various electronic devices.
00:15:22Plus, less material is used to produce cone-shaped cups, which makes the process less wasteful and more cost-effective.
00:15:30It also kind of supports sustainability by encouraging people to drink their water quickly and dispose of their cups immediately
00:15:36after.
00:15:39Most suitcases have two zipper pulls, and it serves several purposes.
00:15:44First of all, if one zipper fails, the other can keep the suitcase closed.
00:15:49Even better, having two zippers allows you to have easier access to small sections of your suitcase without having to
00:15:56open it entirely.
00:15:58And finally, when you have two zippers, you can connect them with a padlock for increased security.
00:16:06Some plastic milk containers have dents on their sides.
00:16:09These dents serve several purposes.
00:16:12When milk spoils, it usually causes swelling and high-pressure buildup inside the container.
00:16:17That's when the dent pops out and doesn't let the jug blow up.
00:16:21Plus, if you decide to freeze the milk, it will expand like any other fluid.
00:16:26And then again, the indentation will pop out and prevent the container from breaking inside your freezer.
00:16:34If you ever had a problem figuring out why fake pockets exist, you need to hear this.
00:16:40The main reason is that if a clothing item has a specific cut or shape, pockets may spoil it.
00:16:46They can alter the item's shape either in the warehouse or already on the retail rack.
00:16:51The solution?
00:16:53Getting rid of the pockets in key areas.
00:16:55Plus, fake pockets are obviously cheaper, and they don't get stretched out.
00:17:02The thermos wasn't actually invented to keep your coffee warm.
00:17:06It was made by a Scottish scientist who wanted a safe place to keep his chemicals at a stable temperature.
00:17:12So, he took two bottles, put the smaller one inside the bigger bottle, and vacuumed out the air between them.
00:17:22Here's how you can protect your bank card from potential fraudsters.
00:17:26Use a marker and cover the last four digits.
00:17:29You can also use a sticker that's easy to remove and place it over the security code.
00:17:34Have you had a house guest that didn't use a coaster?
00:17:37Get a hair dryer and hold it a couple of inches away from the stain.
00:17:40Blow it on medium heat for a couple of minutes to evaporate the watermark.
00:17:44If a faded ring remains, mix equal amounts of vinegar and olive oil in a bowl.
00:17:49Wipe it onto the marked area and rub it in until the stain disappears.
00:17:53Then wipe it off.
00:17:54Don't waste time scrubbing the burnt stains off the bottom of a pan.
00:17:58Instead, fill it with water and add three tablespoons of salt.
00:18:02Let it sit overnight as the salt dissolves the burnt marks.
00:18:05And in the morning, pour the water out of the pan.
00:18:08This way, it will be much easier to scrub all that grease off.
00:18:12Picture this.
00:18:13You're on vacation and your shirt has become all crinkled inside the luggage.
00:18:17You need it tonight, but the hotel doesn't have an iron.
00:18:20Don't panic.
00:18:20Hang the shirt up in the bathroom.
00:18:22And while you relax in a hot shower, the heat and moisture will unwrinkle your shirt.
00:18:27It won't be perfect, but it will get much better without any effort.
00:18:30The football is on.
00:18:32And it turns out you've run out of standard batteries.
00:18:34You can use a smaller battery instead that easily fits inside.
00:18:39Now take some aluminum foil and crunch it up.
00:18:42Fit it into the gap on the negative or flat end of the battery.
00:18:45All done.
00:18:46You can turn on the TV now.
00:18:48Once your flip-flops crack and the plug easily slips out of the hole,
00:18:52it's normally a sign that you need a new pair.
00:18:54But there's a way to extend their mileage.
00:18:57Push the plug back through the hole.
00:18:59Then take a bread clip and attach it to the end.
00:19:01The clip will provide enough support for the plug to remain in place.
00:19:06You've received a package and the receipt is taped on.
00:19:08You've managed to detach it from the box.
00:19:11But how to separate the tape without ripping the paper?
00:19:14Hold both ends of the tape apart.
00:19:16And by pulling it slowly, the tape stretches and separates itself from the paper without tearing it apart.
00:19:23Ziploc bags are perfect to keep things dry.
00:19:26But it would be great if they were larger.
00:19:28Take two and turn one of them inside out.
00:19:31They can now connect and work as one large bag.
00:19:34Big enough to protect a keyboard.
00:19:37There's no need to carry your keys in your hand when you go for a jog.
00:19:41Instead, put them inside your pocket.
00:19:43Take a rubber band, then tie it around the pocket from the inside.
00:19:46This stops the keys from falling out.
00:19:49You've broken your key in the door.
00:19:51It's stuck.
00:19:52Great.
00:19:53Arranging for a locksmith could cost up to $100.
00:19:56But for a cheaper and quicker option, try using a hot glue stick.
00:20:01Heat the end with a lighter.
00:20:02And once it's warm enough to melt, push the glue into the keyhole.
00:20:05The melted glue will enter the available space covering part of the key.
00:20:10Once it cools, it compresses and gains a strong hold of the key's end.
00:20:15Now, just pull it out.
00:20:17If you need to siphon liquid through a hose and want to avoid using your mouth,
00:20:21put one end in the liquid and hold the other upwards with your thumb closing the top.
00:20:26Now shake up and down.
00:20:27This jiggle motion pushes liquid upwards a little each time.
00:20:32And once it reaches the top, lower the exit point and let gravity do the rest.
00:20:37You've left your keys locked inside the car.
00:20:39It's an older model with a roll-down window.
00:20:41You could get the coat hanger and begin the long process of finding the lock.
00:20:45Or use duct tape.
00:20:47Make about 20 2-foot-long strands.
00:20:50Stick them onto the window, allowing enough room for the tape to grab onto at the bottom.
00:20:55Then with a friend, take the ends of the tape, holding them together, and pull downwards.
00:20:59The force will allow the window to lower enough that you can unlock the door.
00:21:04While drilling long screws into hardwood, your old drill might not have enough power,
00:21:09leaving them only halfway in.
00:21:11Before the drill gives up, get a block of wax and scrape the edges of the screws with it.
00:21:16The wax works like a lubricant, melting as it gets warm, and providing easy entry for the screw.
00:21:22You're out camping, but you didn't bring anything to light the barbecue.
00:21:26Take a small plastic bag that won't leak, fill it up with water, and close it tight, making a round
00:21:32bubble.
00:21:32Hold it over where you want to catch the light from the sun.
00:21:35The bag of water will work like a magnifying glass, starting up the barbecue, just as long as it's a
00:21:41sunny day.
00:21:42Missing a corkscrew or a cork breaking halfway?
00:21:45By using a stove lighter, heat the top of the bottle.
00:21:48The heat slightly expands the glass, and this forces the cork out the top.
00:21:53You've superglued your fingers again.
00:21:56Take some salt and pour it on top of your stuck fingers.
00:21:59Put your fingers into the water and slowly rub.
00:22:01The mixture will dissolve the glue and release you in no time.
00:22:05While hanging up a painting, it can be impossible to find that stubborn nail.
00:22:10Place a fork upside down and insert it so the nail is in between the middle fork teeth.
00:22:15The fork has provided a long arm that's separated from the wall, making it easier to slip the string of
00:22:21the painting over the nail.
00:22:23Once it's perfectly balanced, simply remove the fork.
00:22:28You need to put a cake into a container, but taking it out again later by lifting it up from
00:22:33the inside might ruin the cake.
00:22:35Put the lid upside down and place the cake on the lid.
00:22:38The base of the container is now the lid, making it much easier to access slice by slice.
00:22:46Pour out water more efficiently from large jugs and bottles by swirling.
00:22:50This will make the liquid inside spin, creating a vortex.
00:22:53The vortex allows for the air to flow back into the bottle as the water pours out, much faster than
00:23:00the glugging alternative.
00:23:03There's an easier and less messy way to remove eggshells from a boiled egg.
00:23:08Once fully boiled, crack the shell on both ends by tapping them.
00:23:11On one end, pinch off the shell.
00:23:14Use the opened end to blow with your mouth.
00:23:16The force of air will push the flesh and expand the eggshell, forcing out the egg undamaged.
00:23:23When the hinges of your laptop break, repairing them can cost up to $300.
00:23:29A far cheaper fix is to buy a picture frame and tape it to the back of the screen.
00:23:34You've dropped a small piece of jewelry on the floor, seemingly impossible to find.
00:23:39Take a stocking and place it over the end of the vacuum hose.
00:23:42Give the area a good vacuum and check the end periodically.
00:23:46You will eventually find it sitting at the end.
00:23:49You've drilled a hole in the wall, but the drill hole is now too wide.
00:23:53Remove the screw and find an object that is slightly shorter and thinner.
00:23:57Pieces of plastic, small wires, paper clips, or even toothpicks are perfect.
00:24:02Place whichever item you find inside the hole.
00:24:05It's filled the gap enough so the screw will now re-enter securely.
00:24:08Taking the trash out can put you in a gross scenario of getting bin juice on you.
00:24:13A great way to avoid this is by placing old papers at the bottom of the bag.
00:24:18Now, not only does it absorb all the liquids from the food and other sources,
00:24:22but also helps prevent bad smells from forming within a bin.
00:24:26Nobody likes mosquitoes, and pesticides are pricey.
00:24:30A cheap alternative is to take a plastic bottle and cut the top part off from the bottom of the
00:24:35funnel.
00:24:36After removing it, turn it upside down and put it inside the bottle.
00:24:40Mix two cups of warm water with two tablespoons of sugar.
00:24:44The mosquitoes will be attracted to the formula inside and become trapped.
00:24:48Now just sit back and relax without getting bitten.
00:24:54Many shirts have two buttons on the cuffs, but only one buttonhole.
00:24:58So what is the second button for?
00:25:01Turns out you can use it whenever you're wearing a watch, so the cuff is looser.
00:25:07Most clothing items you buy come with a small bag of fabric or a button, or both.
00:25:13Buttons obviously can be used as a replacement if you lose the original ones.
00:25:18Pieces of fabric can be used to patch up a hole,
00:25:20but most importantly, it's a tester.
00:25:23You can use it to test different washing products on it and see what happens to the fabric.
00:25:30Some umbrellas have a tip at the top, and it turns out it's not just a pretty design.
00:25:36When going inside on a rainy day, you should just close your umbrella
00:25:40and tap the tip against the floor to drain the water faster and more effectively.
00:25:46Many backpacks have this diamond with two parallel cut-out slits on its front,
00:25:51and it's there for your comfort.
00:25:53You can attach something to it, like a water bottle or shoes.
00:25:57It comes especially handy if you travel somewhere or go hiking,
00:26:01so you don't have to hold your stuff.
00:26:05Okay, the next thing is gear loops, and probably from the name of it,
00:26:09you already have an idea what they're there for.
00:26:12You can strap in some useful gear you need to have with you,
00:26:15like trekking poles or shovels.
00:26:17Some gear will need to be secured to do it.
00:26:20Drop the handle through the loop and rotate it upward.
00:26:23Then, secure it with the elastic hook at the top, and you're golden.
00:26:29On the back of many makeup and hygiene products,
00:26:32you can find this symbol with a marking, like 6M, 12M, and 24M.
00:26:39This is the number of months this product can serve after you open it
00:26:43and before you should throw it out.
00:26:46The two sides of a cotton pad are different
00:26:49because each of them has a particular purpose.
00:26:52A cotton pad has several layers to ensure that it's soft,
00:26:56strong, and can absorb liquids.
00:26:58The edge is stitched to hold it all together.
00:27:02The smooth side of a pad is for applying products,
00:27:05like tonics and lotions.
00:27:07And the embossed side is best for cleansing and makeup removal.
00:27:12Also, any pack of cotton pads has those strings on the sides.
00:27:16They're there so you can hang the package somewhere.
00:27:19Then, you can open the package at the bottom,
00:27:22where the perforated line is, and take them out.
00:27:26Did you know that there is an efficient way to pull a thread from yarn?
00:27:30When you pull from the outside, the yarn rolls away,
00:27:33so you need to hold it.
00:27:35However, if you pull it from the center, it will stay together.
00:27:40We're all familiar with staplers,
00:27:42but I bet you don't know all its secrets.
00:27:45Most staplers have a compartment to store spare staples,
00:27:49which can be located either on top or at the bottom.
00:27:53Also, surprise, this metal plate you press staples against can be turned around.
00:27:58This way, the device will be able to staple your documents
00:28:01by turning the metal ends outwards.
00:28:05No need to wonder whether you need to get a smaller or bigger container.
00:28:09Turns out, plastic food containers have volume measurements on their bottoms,
00:28:13indicating how much food they can fit.
00:28:17Ceiling fans come with a small switch on the inside of the blade.
00:28:21You might not have noticed it because it's not in plain sight,
00:28:24so check yours out.
00:28:26This switch allows you to change the direction of rotation.
00:28:30Now, why would you want to do that?
00:28:32The blades of a fan push the air in different directions,
00:28:36depending on the way they rotate.
00:28:38In the summer, you need the air to be pushed down
00:28:41to create the effect of a breeze.
00:28:43In the winter, the direction should be changed
00:28:46so that the air is pushed towards the ceiling.
00:28:49It then heats up before going down the walls.
00:28:54Have you noticed that the gas tank sign on cars' dashboards
00:28:58has a little arrow next to it?
00:29:00Well, this arrow has a purpose.
00:29:03It points at the side of the car where the gas tank is located.
00:29:06It's very useful for forgetful people
00:29:09who constantly wonder where the gas tank is
00:29:11and also for those who drive rentals once in a while.
00:29:15The answer is right in front of your eyes.
00:29:17If you can't find the arrow on your panel,
00:29:20then the fuel hose on the icon indicates the side instead.
00:29:26All car tires have 12-digit numbers printed on them,
00:29:29and they're actually important codes for car owners
00:29:32if they want to get the right tire.
00:29:34The first letter identifies the type of tire.
00:29:38P stands for a tire for light passenger cars,
00:29:41and LT is for heavy vehicles.
00:29:44Then, the following numbers stand for the width of the tire,
00:29:48its radial, and its diameter.
00:29:52Measuring tapes have that metal stud on the end,
00:29:55which you can use to attach the tape to the surface you measure.
00:29:58This way, you don't need to hold it yourself.
00:30:01But there's also a small slot,
00:30:03which can be used to hang the tape on a nail,
00:30:06again, to free your hands and keep measuring.
00:30:09The bottom of the end of the tape has a ridged edge.
00:30:13It will help you make a mark if you don't have a marking tool with you.
00:30:18On the tape, there are black diamonds that are placed every 19.2 inches.
00:30:24They're useful for construction workers when spacing engineering joists.
00:30:28They can also be useful for you if you want to hang something heavy, for example.
00:30:33The diamond will mark the exact center of a wooden joist.
00:30:37Those are placed 16 inches apart from one another.
00:30:40There, you can drill something to that center
00:30:43to make sure whatever you hang is safely attached to the joist
00:30:47instead of the unreliable thin wall.
00:30:50Pictures will survive,
00:30:51but it's particularly important if you're hanging something heavy.
00:30:56Did you know that batteries have an expiration date?
00:31:00Yes, it's printed right on their label,
00:31:03but I've never noticed it before.
00:31:05The expiration date doesn't mean you can't use it after that.
00:31:08It's more like a recommended usage period,
00:31:12after which the manufacturer can't guarantee full battery life
00:31:17due to deteriorated components.
00:31:21These little feet keyboards have are actually a standard.
00:31:25The height of a keyboard should be adjustable,
00:31:29allowing the angle between 0 degrees and 15 degrees.
00:31:33The reason to fold the feet out is for you to see the keys better,
00:31:38in case you don't type blindly.
00:31:41A little problem that comes with it is that, in this case,
00:31:45your wrists are bent,
00:31:47and it's not good to keep them in this position for a long time.
00:31:52Pans have those holes on the ends of their handles.
00:31:55They're not just there for you to hang them.
00:31:58You can also place your cooking spoon in there.
00:32:01It'll hang right above the pan,
00:32:04and the sauce will not spill around.
00:32:06Make sure to tap off the sauce or food beforehand, though,
00:32:11so that it doesn't go down the spoon's handle.
00:32:15Stickers with numbers you can find on fruits
00:32:18can tell you some information on how the food was grown.
00:32:22A four-digit code that starts with a four
00:32:26means that the fruit was grown conventionally,
00:32:29meaning it contains chemicals and pesticides.
00:32:33So your best choice should be a fruit with a five-digit number.
00:32:37And if you see the number nine,
00:32:40it indicates that the fruit is certified organic.
00:32:45On the bottom of plastic bottles,
00:32:47you can often notice a mark of a triangle
00:32:50with a number engraved in the middle.
00:32:54This number specifies the type of plastic
00:32:57that was used to produce the bottle.
00:33:00These codes help people and local recycling centers
00:33:03to sort returns.
00:33:05Products that were made of plastic of types 1 and 2
00:33:10are the easiest ones to recycle.
00:33:13Plastics of types 3 through 7 are tougher to recycle.
00:33:19Okay, I know it's kind of cold to the touch,
00:33:22especially on a freezing winter's day,
00:33:23but did you know that brass doorknobs
00:33:25actually serve a purpose
00:33:26apart from looking classy and shiny?
00:33:28Since it's a copper alloy,
00:33:30brass has antimicrobial properties.
00:33:32That means it can help get rid of harmful germs and bacteria,
00:33:36sometimes in up to two hours.
00:33:38In high-traffic areas,
00:33:40that's all the more useful,
00:33:41but since brass is much costlier
00:33:43than other metals like nickel and steel,
00:33:45you barely see these types of doorknobs anymore nowadays.
00:33:49Speaking of lovely multi-purpose items,
00:33:51most screwdrivers have a tiny little secret of their own.
00:33:54They can sometimes be slid through a wrench
00:33:56so that they can be used to create more torque when twisting,
00:33:59not to mention the uses when it comes to bolts
00:34:02in hard-to-reach places.
00:34:04There's a reason why buttons on women's shirts
00:34:06are for the left-handed,
00:34:08and it has nothing to do with fashion.
00:34:10This practice dates back to the times
00:34:12when chambermaids were helping ladies dress themselves,
00:34:15and it was easier for them to perform their job
00:34:17with this orientation.
00:34:19Having the buttons placed as such
00:34:21indicated a sign of wealth,
00:34:23so it's easy to imagine why the practice carried on.
00:34:26Even though most people dress themselves nowadays.
00:34:29Next time you receive a package in your mail,
00:34:31take a look at your box cutter.
00:34:33If it features some diagonal lines on the blade,
00:34:36you're in for a little design perk.
00:34:38Turns out that these are blades that snap off.
00:34:42Continuously cutting cardboard
00:34:43can dull the sharp edge of the blade.
00:34:44To help prevent the need to buy a brand new box cutter,
00:34:47the top segment along the next line
00:34:49can be broken off to reach a new sharp edge.
00:34:52To do this, check out the small hole at the base of the tool,
00:34:56sometimes called the blade snapper.
00:34:58The people that first came up with this brilliant invention
00:35:01were engineers inspired by the way chocolate bars are segmented.
00:35:05Hold on a minute.
00:35:06Don't throw away the cardboard package just yet.
00:35:08Most likely, you'll have some silica gel packets
00:35:11somewhere at the bottom of the box.
00:35:13Since this gel is basically a drawing tool,
00:35:15it gathers up the moisture out of its environment,
00:35:17so you can store these packets for further occasions.
00:35:20Whether you'll need to dry out your phone
00:35:22or some other electrical object,
00:35:24you can place them in a container next to the silica gel
00:35:27to reduce the damage.
00:35:29You don't have to be a mechanic
00:35:31to know when a standard car tire needs replacing,
00:35:33since they come equipped with a neat indicator.
00:35:36Take a closer look,
00:35:37and you'll see that treads within the tire
00:35:39are a bunch of rubber notches.
00:35:42When the treads are evened out with the perpendicular bars,
00:35:45it's a sign you need to book an appointment
00:35:47with your local car service.
00:35:48Since most likely, the tires have lost most of their traction
00:35:52and may not be safe for driving any longer.
00:35:55The upper corners of a car windshield
00:35:57feature textured black dots melted into the glass edges.
00:36:00This neat add-on isn't there for design purposes.
00:36:04It's called Frit Glazing,
00:36:06which means that a special type of ceramic paint
00:36:09is added to the window for protecting its sealant from UV rays.
00:36:13It also conceals and creates a coarser surface
00:36:16for the adhesive used to set the window in place.
00:36:20Whenever you're up for a drive,
00:36:22check out if there's a small tab under your car's rearview mirror.
00:36:26Bet you didn't know it's there to help switch the mirror
00:36:29from daytime to nighttime views.
00:36:32It uses a prismatic glass technology
00:36:34to blur the reflection
00:36:36and reduce the glare of headlights behind you in traffic.
00:36:39People came up with these manually tilted mirrors in the 1930s,
00:36:43but they became standard somewhere in the 1970s.
00:36:47While you're in the car,
00:36:48check out the headrests,
00:36:49as you most likely don't know
00:36:51that they carry a little disguised purpose.
00:36:53Of course, they're adjustable
00:36:55to accommodate passengers of any height
00:36:57so that they get the proper support
00:36:58for their heads and necks.
00:37:00The hidden feature is that they are detachable
00:37:03and come with two very solid metal bars.
00:37:06Should you ever find yourself stuck in a car
00:37:08and need to make a fast getaway?
00:37:10These bars come in handy
00:37:12to crack out the car windows.
00:37:14So you're out for a drive
00:37:16and you're suddenly out of gas.
00:37:17What I'm about to describe
00:37:19sounds more like a meme
00:37:20than an actual situation bound to happen.
00:37:22But what if you're in such a hurry
00:37:24that you accidentally drive off
00:37:26with the gas nozzle still in the tank?
00:37:28Well, the nozzles have been designed
00:37:30to prevent any hazards from happening,
00:37:33rest assured.
00:37:34They feature a breakaway device
00:37:35that will allow the hose to separate
00:37:37when taken out with enough force.
00:37:40Initially designed in the early 20th century
00:37:42to be worn exclusively by basketball players,
00:37:45sneakers soon became
00:37:47one of those fashion fundamentals,
00:37:48similar to jeans and leather jackets.
00:37:51If you take a closer look at them,
00:37:52you'll see they have two extra holes on the side,
00:37:55similar to the shoelace holes.
00:37:56They're manufactured as such
00:37:58not only to provide extra ventilation,
00:38:01but to allow people to get extra creative
00:38:03with their laces when wearing the shoes.
00:38:05Admit it, you've always thought that chopsticks
00:38:07are merged at the end
00:38:09for the sole purpose of keeping them together
00:38:10until you're ready to dig into your meal.
00:38:13That may or may not be the whole truth.
00:38:15Under a more detailed inspection,
00:38:18the wooden tools feature a square-shaped end.
00:38:21Chopsticks manufactured like this
00:38:22date back to an old Japanese traditional design,
00:38:25which can help with breaking the ends easily.
00:38:28The separated end can then be used
00:38:30as a resting block for the chopsticks
00:38:32to keep it more sanitized
00:38:34in hopes it can be used again,
00:38:35since they won't be touching the table
00:38:37or any other surface.
00:38:39Women's bikes have a special design,
00:38:42which, surprisingly,
00:38:43has a historical and fashionable purpose.
00:38:45The lower frame is for the most part
00:38:48meant to make up
00:38:48for the generally shorter height of ladies,
00:38:50compared to that of the average gentleman.
00:38:53While that is the case for handlebars and saddles,
00:38:56the overall frame is lower
00:38:57for an additional purpose.
00:38:59Way back when women wore long skirts
00:39:01and dresses all day,
00:39:02every day they needed to make sure
00:39:04their outfits wouldn't get caught in the frame.
00:39:07That's how we came up
00:39:08with a lower-framed bicycle,
00:39:09perfectly made for women
00:39:11and their needs at the time.
00:39:13The fact that toothpastes are multicolored
00:39:16is not just a nice perk
00:39:18to make dental hygiene more fun.
00:39:20There's a secret meaning
00:39:21related to each of the colors,
00:39:22which dates back to the 1970s.
00:39:25In those days,
00:39:26people grew more and more interested
00:39:28in their oral health care,
00:39:29and as such,
00:39:31they were looking for products
00:39:32which could do more
00:39:33than merely clean their teeth.
00:39:35One company was the pioneer in that regard,
00:39:38adding mouthwash to its toothpaste,
00:39:40meaning the blue strip.
00:39:41They later added on the red strip,
00:39:43meant to feature ingredients
00:39:45which helped with gum care.
00:39:47Speaking of toothpaste,
00:39:49check the cap next time you open a new tube.
00:39:51You may be in for a little surprise.
00:39:53There's a pointed cone shape inside the cap,
00:39:56so you can puncture the seal of the toothpaste
00:39:58without cutting yourself
00:39:59or ruining your manicure.
00:40:01Not to mention,
00:40:02it's more hygienic
00:40:03since you won't be able to transfer germs
00:40:04or other bacteria
00:40:06into the product itself.
00:40:08On the subject of bathroom countertop items,
00:40:11toothbrushes come with a neat add-on
00:40:13hidden in the bristle patterns.
00:40:15Apart from making the toothbrush look cooler,
00:40:17they also do come with a practical purpose.
00:40:20Most toothbrushes come with a pattern
00:40:22of blue bristles
00:40:23intertwined with white ones.
00:40:25The blue dye is meant to fade out,
00:40:27signaling the time
00:40:28when you need to replace your toothbrush.
00:40:31Dentists say that toothbrushes
00:40:32should be replaced
00:40:33every three to four months,
00:40:35but it does serve as a great reminder
00:40:36in case you forget.
00:40:38Still love playing with Lego?
00:40:40Don't judge.
00:40:41Hey, it's a great hobby for all ages.
00:40:43Notice there's a hole on top of the Lego heads?
00:40:46Behold, you're looking at a safety feature
00:40:48that the people at Lego
00:40:49designed to prevent choking hazards.
00:40:52The most dangerous issue
00:40:54should a person swallow any of these pieces
00:40:56is the blocking of the airways.
00:40:58Designing a hole inside the Lego head
00:41:01helps the air to flow freely through the piece
00:41:03until it can be removed safely.
00:41:06We're now used to all sorts of modern light bulbs,
00:41:08some tubular,
00:41:09some shaped like diamonds,
00:41:11and some even twisted all together.
00:41:14Historically, light bulbs were round
00:41:16and the initial shape
00:41:17served a purpose in itself.
00:41:19It was mainly connected to the fact
00:41:21that glass bulbs were hand-blown,
00:41:23which gave them the round shape to begin with.
00:41:25The hidden practical reason
00:41:27was that the light bulb filament
00:41:28needed to be at the same distance
00:41:30from every surface of the glass sphere.
00:41:32The easiest way to achieve this
00:41:34was to make the glass in the shape of a globe.
00:41:38Okay, today I'll show you things you've never seen
00:41:42and tell you stuff you never knew.
00:41:44Wow, all in one video!
00:41:46What a bargain!
00:41:47For example,
00:41:48these soda found stations in fast food restaurants.
00:41:51We all see the nice side of it,
00:41:53but have you ever wondered where all this soda comes from?
00:41:56Let me take you behind the scenes.
00:41:58Ta-da!
00:41:59Turns out it's a pile of boxes with tubes.
00:42:02So when the drink runs out,
00:42:04the employees change the box
00:42:05and plug the tube back in.
00:42:08Okay, let's peek into a couple more places
00:42:10where we normally don't belong.
00:42:13This is, for example,
00:42:14what you will see if you cut the screen of a Mac open.
00:42:17And here's what's hidden
00:42:19behind the dryers in a public laundromat.
00:42:21Today, 4 out of 5 households in the U.S. have a dryer,
00:42:25but they weren't so widely accessible
00:42:27when they first appeared in the 1950s
00:42:29because they were way too expensive
00:42:31for the average homeowner.
00:42:33Now, grocery shopping isn't an uncommon practice,
00:42:36and we all have walked past dairy fridges a million times.
00:42:40But have you ever wondered what's behind them?
00:42:42Turns out they're just shelves,
00:42:44and store employees stack the products from the other side.
00:42:47It makes perfect sense,
00:42:49but I never imagined it like this.
00:42:51Now, this photo shows what's behind the elevator button.
00:42:55Obviously, a bunch of cords.
00:42:57The buttons are all wired to a computer
00:42:59that manages the elevator.
00:43:00How does the computer know
00:43:02where the elevator is at a particular time?
00:43:05Well, there are several possible systems,
00:43:07but the most common one
00:43:08is a long vertical tape in the shaft
00:43:11with a series of holes.
00:43:12A sensor counts the number of holes that are passed,
00:43:15and that's how the location is determined.
00:43:18Okay, there are a couple of common things
00:43:21we all know,
00:43:22but the purpose of which remains a mystery to most.
00:43:25So, let me share these secrets with you.
00:43:28Those metal rivets on jeans
00:43:29have been there from the very beginning.
00:43:32Jacob Davis,
00:43:33the iconic man who made the first pair of jeans,
00:43:36added copper rivets to places
00:43:38where pants are most likely to rip.
00:43:40Today, they have more of a decorative
00:43:42and distinctive purpose,
00:43:43since they are a traditional attribute
00:43:45of the jeans everyone knows of.
00:43:47Now, I'll bet you know
00:43:49there are extra loops on some shoes.
00:43:51No, they're not for sweat or ventilation.
00:43:54Those are extra loops for laces,
00:43:56just like other loops you use.
00:43:58But they're there to tie your shoe
00:44:00around the ankle
00:44:01to prevent your foot from moving aside.
00:44:03That's especially helpful
00:44:05if you're hiking
00:44:05and ascending and descending hills and trails.
00:44:09Now, have you ever noticed
00:44:10those half-belt thingies
00:44:11many coats and jackets have at the back?
00:44:14Turns out,
00:44:15they first appeared
00:44:16on oversized military jackets.
00:44:18So, the extra fabric
00:44:19could be collected on the back
00:44:20and the person doesn't stumble when working.
00:44:23Today, those belts are only added
00:44:25for the sake of style and tradition.
00:44:27Most clothing items you buy
00:44:29come with a small bag of fabric
00:44:31or a button, or both.
00:44:33These are actually not useless.
00:44:35Buttons obviously can be replaced
00:44:37if you lost the original one.
00:44:39Pieces of fabric can serve two purposes.
00:44:41You can patch up the hole,
00:44:43but the main purpose
00:44:44is to provide you
00:44:45with a sample of cloth
00:44:47so you can use it
00:44:48to test different washing products on it
00:44:50and see what happens to the fabric.
00:44:53Now, pom-poms on woolen hats.
00:44:55Did you know that sailors
00:44:57were wearing hats with pom-poms
00:44:58in the 18th century
00:44:59to protect their heads
00:45:01in case they accidentally whacked them?
00:45:03Regular people were wearing them in Scotland,
00:45:05and the color of the pom-pom
00:45:07signified the person's social status.
00:45:09People got back to wearing hats
00:45:11with those cute decorative items
00:45:13during the Great Depression.
00:45:14They're made of spare yarn,
00:45:16so it was a cheap way
00:45:17to decorate your hat.
00:45:19Now, if you haven't noticed,
00:45:21some sidewalks have little plates
00:45:23with bumps on them.
00:45:24Most people don't pay much attention to them,
00:45:26but they're very important
00:45:28for visually impaired people.
00:45:29It signals a slope
00:45:31that then leads to a crosswalk.
00:45:33Also, several patterns
00:45:35signal different things.
00:45:36Have you noticed that the icon
00:45:38of a gas tank on car dashboards
00:45:40has a little arrow next to it?
00:45:42Well, the arrow has a purpose.
00:45:44It points at the side of the car
00:45:46where the gas tank is located.
00:45:48Very useful for forgetful people,
00:45:51like me,
00:45:51who constantly wonder
00:45:52which side it is on,
00:45:54and also for those
00:45:55who drive rentals once in a while.
00:45:57The answer is right in front of your eyes.
00:45:59If you can't find the arrow on your panel,
00:46:02then the fuel hose on the icon
00:46:03indicates the side instead.
00:46:06Now, on the back of many makeup
00:46:08and hygiene products,
00:46:09you'll find this symbol
00:46:11with a marking like 6M, 12M, and 24M.
00:46:14This is the number of months
00:46:16this product can serve you
00:46:17before you should toss it out.
00:46:19You might know that whistles
00:46:21work perfectly fine
00:46:22even if they don't have that ball inside.
00:46:25And yet, they have it.
00:46:26But why?
00:46:27Even though there's a sound
00:46:29without the ball,
00:46:30the noise it creates is very flat,
00:46:32and it's not distinguishable enough.
00:46:34When the whistle has a ball inside,
00:46:37then it starts moving with every blow,
00:46:39indicating different pitches
00:46:40and making the noise more noticeable.
00:46:43Lollipop sticks
00:46:44have those squared holes
00:46:46on the end of their sticks
00:46:47for a reason, too.
00:46:48When the candy is put on the stick,
00:46:50some of it goes into the hole,
00:46:52fixating the candy part.
00:46:54This way,
00:46:55the candy ball,
00:46:56or whatever shape,
00:46:57is less likely to fall off the stick.
00:46:59Yeah, it's a bummer when that happens.
00:47:02Measuring tapes
00:47:02have that little metal stud on the end.
00:47:05Most people know
00:47:06that you can use it
00:47:07to stick it to the side
00:47:08of the surface you're measuring.
00:47:09But it's not the only cool thing about it.
00:47:12Look,
00:47:13there's also a small slot.
00:47:14And this slot can be used
00:47:16to hang it on a nail,
00:47:17again,
00:47:18to free your hands
00:47:19and keep measuring.
00:47:20The bottom of the end of the tape
00:47:22has a ridged edge.
00:47:23It'll help you make a mark
00:47:25if you don't have a marking tool with you.
00:47:27Have you ever wondered
00:47:28why the taped blade is curved?
00:47:30Well,
00:47:31it helps to keep it rigid
00:47:32when extended.
00:47:34Pay a closer look at the blade.
00:47:36Apart from numbers and markings,
00:47:38there are also black diamonds.
00:47:40Those are there every 12.2 inches,
00:47:43and they're useful
00:47:44for construction workers
00:47:45to space engineering joists.
00:47:47They can also be useful for you
00:47:49if you want to hang something heavy,
00:47:51for example.
00:47:52The diamond will mark
00:47:53the exact center of a stud,
00:47:55which is placed 16 inches apart
00:47:57from one another.
00:47:58And you can drill something
00:48:00to that center
00:48:00to make sure
00:48:01whatever you hang
00:48:02is safely attached.
00:48:04Now,
00:48:05most coins have ridges,
00:48:07and this is the legacy
00:48:08of the olden days.
00:48:10You see,
00:48:10back in the day,
00:48:11all coins were linked
00:48:12to a silver standard.
00:48:14The amount of silver
00:48:15used in a coin
00:48:15was proportionate
00:48:17to the value of the coin.
00:48:18So,
00:48:19the more actual silver
00:48:20was used to make the coin,
00:48:21the higher its value was.
00:48:23Hi-ho silver!
00:48:25Do you remember
00:48:25the Lone Ranger?
00:48:27Silver was the name
00:48:28of his horse.
00:48:29Eh,
00:48:29never mind.
00:48:30Anyway,
00:48:31all the coins
00:48:32had precious metal in them,
00:48:33and some people
00:48:34started shaving off
00:48:36a little bit of silver from it.
00:48:37It wasn't noticeable on one,
00:48:39but if done on several,
00:48:41people could get
00:48:42quite a bit
00:48:43of that precious metal.
00:48:44So,
00:48:45to prevent fraud,
00:48:46the edges were made
00:48:47with ridges
00:48:48for security reasons.
00:48:49So,
00:48:49if someone attempted
00:48:50to shave it off,
00:48:51the ridges would disappear,
00:48:53and no one would accept
00:48:54that coin anymore.
00:48:55Smart!
00:48:56Today,
00:48:57no one makes coins
00:48:58out of silver.
00:48:59The coins just
00:49:00represent the value.
00:49:01But the ridges
00:49:02are kind of a
00:49:03cultural heritage now.
00:49:04And finally,
00:49:05a typical plastic milk jug
00:49:07often has inverted circles
00:49:09on one or more
00:49:10of the sides.
00:49:11Not like alien crop circles,
00:49:13this dimple is there
00:49:14to make the jug
00:49:15more resistant
00:49:16and to prevent it
00:49:17from erupting
00:49:18in case the jug
00:49:19falls on the floor.
00:49:20The dimple gives
00:49:21some more space
00:49:22for the liquid
00:49:22to expand.
00:49:23Also,
00:49:24as the expiration date
00:49:26approaches,
00:49:26the microbes in the milk
00:49:28start to expel
00:49:28some gases.
00:49:29As there are more
00:49:30of them trapped inside,
00:49:32the pressure in the jug
00:49:33is rising.
00:49:34The dimple takes care
00:49:35of the expansion
00:49:36and prevents the jug
00:49:37from exploding.
00:49:38And the cows
00:49:39are utterly delighted
00:49:41that their hard work
00:49:42is not wasted.
00:49:44Me!
00:49:47Some pieces of clothing
00:49:48come with a small
00:49:49patch of fabric
00:49:50with a button on it.
00:49:51While it's quite obvious
00:49:53how to use the button,
00:49:54the fabric's purpose
00:49:55isn't so apparent.
00:49:56It's not there
00:49:57to patch holes.
00:49:58You're supposed to test
00:49:59your cleaning products
00:50:00on it.
00:50:01Then,
00:50:02if something goes wrong,
00:50:03you won't ruin
00:50:04the whole garment.
00:50:05The seemingly random
00:50:06dime-sized hole
00:50:07in the elevator door
00:50:08is actually a keyhole.
00:50:10If the elevator doors
00:50:11get stuck,
00:50:12an operator can open
00:50:13them manually
00:50:14by inserting a special
00:50:15key in this hole.
00:50:17The same tool
00:50:18is used when an elevator
00:50:19needs routine maintenance.
00:50:21Some plastic milk containers
00:50:23have dents in their sides
00:50:24that serve several purposes.
00:50:26For one,
00:50:26if milk spoils,
00:50:28this process can cause
00:50:29swelling and high-pressure
00:50:30buildup inside the container.
00:50:32That's when the dent
00:50:33comes in handy.
00:50:34It pops out
00:50:35and doesn't let the jug
00:50:36blow up.
00:50:37Plus,
00:50:37if you decide
00:50:38to freeze the milk,
00:50:39it'll expand
00:50:40like any other liquid.
00:50:41And then again,
00:50:42the indentation
00:50:43will pop out
00:50:44and prevent the container
00:50:45from bursting
00:50:45inside the freezer.
00:50:47A first-timer
00:50:48might think
00:50:49that Chinese takeaway boxes
00:50:50have a peculiar shape.
00:50:52The more experienced diners
00:50:54know that by unfolding
00:50:55the sides of these containers,
00:50:57you get a paper plate
00:50:58with the food
00:50:59already sitting on top.
00:51:01The lines on plastic
00:51:02solo cups
00:51:03can help you measure out
00:51:04liquids and non-liquids too.
00:51:06From the bottom up,
00:51:06those lines coincide
00:51:08with the measurements
00:51:08of 1,
00:51:095,
00:51:10and 12 ounces.
00:51:11The lowermost line
00:51:13is the perfect portion
00:51:14of mouthwash.
00:51:15The middle one
00:51:16is a serving
00:51:16of cereal for breakfast.
00:51:18And the topmost
00:51:19is the amount of water
00:51:20recommended to drink
00:51:21four to five times a day.
00:51:24Striped toothpaste
00:51:25will always come out
00:51:26in stripes
00:51:27even if you mash the tube
00:51:28with all your strength.
00:51:29No magic involved though.
00:51:31The product is very dense
00:51:33and viscous
00:51:33so it doesn't mix well.
00:51:35The white,
00:51:36blue,
00:51:36and red parts
00:51:37of the toothpaste
00:51:37are pushed down
00:51:38at an even rate
00:51:39thanks to their
00:51:40similar physical properties.
00:51:42And viscosity
00:51:43helps the stuff
00:51:44be pushed down
00:51:45and out
00:51:45from the edges first
00:51:46so no matter
00:51:47how hard you try,
00:51:49there will always be
00:51:50those perfect stripes.
00:51:52Not every iPhone owner
00:51:53pays attention
00:51:54to an almost
00:51:55unnoticeable
00:51:56little hole
00:51:57between the camera
00:51:57and the flash.
00:51:58It's the gadget's
00:52:00second microphone.
00:52:01Its role
00:52:02is to block
00:52:02outside noises
00:52:03when you're filming a video.
00:52:05This microphone
00:52:06also makes the sound clearer.
00:52:07Use it when you're
00:52:08on the phone
00:52:09in a noisy place.
00:52:11Dental floss
00:52:11can slip out
00:52:12from your fingers
00:52:13and tangle.
00:52:14To avoid such problems,
00:52:15tear off a piece
00:52:16and floss
00:52:16and tie its two ends together.
00:52:18It will be much easier
00:52:20to use
00:52:20and won't hurt your hands.
00:52:23Most frying pans
00:52:24have holes
00:52:24in their handles.
00:52:25You can use it
00:52:26to hang the thing
00:52:27on a hook on the wall
00:52:27but that's not
00:52:28its original purpose.
00:52:30When you're cooking
00:52:30something in the pan,
00:52:32the hole in the handle
00:52:33is there to hold
00:52:33your messy spoon.
00:52:35It's especially important
00:52:36for plastic utensils
00:52:37because you can't
00:52:38leave them in the pan
00:52:39for long
00:52:39since they can melt.
00:52:42Some toothpicks
00:52:43have several grooves
00:52:44on the blunt end.
00:52:45When you need to use one,
00:52:47break off the grooved end
00:52:48and put it on the table.
00:52:49It'll serve as a rest
00:52:51to keep your toothpick
00:52:52from touching the surface.
00:52:54You've probably noticed
00:52:55that most soft drink lids
00:52:57have ridges
00:52:58and three bumps on them.
00:52:59With their help,
00:53:00the lid can turn
00:53:01into a coaster
00:53:01once you put it on the table
00:53:02and place the cup
00:53:03on top of it.
00:53:04No more spillage.
00:53:06Bath foam
00:53:07isn't only for fun
00:53:08or a nice smell.
00:53:10It also helps regulate
00:53:11the temperature.
00:53:13The bubbles keep
00:53:14the water hot
00:53:15so you can enjoy
00:53:15a bath a bit longer.
00:53:17Anyway,
00:53:18it works for acrylic
00:53:19bathtubs only.
00:53:20Those made of metal
00:53:21lose heat really fast
00:53:22either way.
00:53:23Almost all measuring tapes
00:53:25have a metal tip
00:53:26with a small slot
00:53:27on the end.
00:53:28You can use this slot
00:53:29to hang the tape
00:53:30on a nail
00:53:31or a screw
00:53:31to make measurements
00:53:32without anyone's help.
00:53:34Sometimes this tip
00:53:35has a row of sharp points
00:53:36along the edge
00:53:37on one side.
00:53:38That comes in handy
00:53:39when you want to leave a mark
00:53:40without using a pencil.
00:53:43A pack of cotton pads
00:53:45has those strings on it
00:53:46so we could hang it
00:53:47on some hook or holder.
00:53:49And no,
00:53:49there's no need to untighten
00:53:51and tighten the pack again.
00:53:52Look at the bottom
00:53:53of the pack.
00:53:54It has a perforated line.
00:53:56Tear along that
00:53:57and now you're good
00:53:58to pull out a cotton pad.
00:54:00A triple handle
00:54:01on a jerry can
00:54:02is there to make it easier
00:54:03for two people to carry it
00:54:04and distribute the fuel evenly.
00:54:06Gas cans often
00:54:07have a second hole
00:54:08that actually needs
00:54:09to be uncapped too
00:54:10before you pour the gas.
00:54:12The air passage
00:54:13will prevent it
00:54:14from pouring out.
00:54:16Lemons get juicier
00:54:17if you warm them up
00:54:18a little bit
00:54:18in the microwave.
00:54:19The heat softens
00:54:20the frozen membranes
00:54:21so the juice
00:54:22can flow out freely.
00:54:23More lemonade for you.
00:54:25When you buy
00:54:26some grated cheese
00:54:27get ready for a surprise.
00:54:29If the package says
00:54:30it contains cellulose
00:54:31it means that
00:54:32the cheese does contain
00:54:33wood pulp.
00:54:34Don't worry
00:54:35it's digestible.
00:54:37It's added
00:54:38to prevent the product
00:54:39from clumping.
00:54:40The expiration date
00:54:42on mineral water
00:54:43isn't about water
00:54:44going bad.
00:54:45Actually,
00:54:45no water can spoil
00:54:47but the bottle can.
00:54:48Over time
00:54:49it starts leaking
00:54:50some chemicals
00:54:51that aren't quite safe.
00:54:53The spike in the cap
00:54:54of a tube of ointment
00:54:55or cream
00:54:56is there so you can
00:54:57puncture the tiny foil seal.
00:54:58No need to grab a toothpick
00:55:00or try to use your fingernails
00:55:01to peel it off.
00:55:03Post-it notes
00:55:04are supposed to be
00:55:05peeled off
00:55:05from the side
00:55:06like you're turning
00:55:07the page in a book.
00:55:08Most of us tear them
00:55:09from the bottom
00:55:10and that just creates
00:55:11a crease
00:55:11and makes the whole note
00:55:13less sticky.
00:55:15To prevent water
00:55:16from boiling over
00:55:17just lay a wooden spoon
00:55:18across the rim
00:55:19of the pot.
00:55:19It only works
00:55:20for a little while though.
00:55:21If the spoon's surface
00:55:22gets heated up
00:55:23to the boiling point
00:55:24the bubbles
00:55:25will just foam up
00:55:26and around it.
00:55:27That's why metal spoons
00:55:28won't do.
00:55:29They heat up too quickly.
00:55:31Some erasers
00:55:32have two colors
00:55:33and textures
00:55:34not for pen ink
00:55:35versus pencil lead
00:55:36but for different
00:55:37types of paper.
00:55:38You're supposed
00:55:39to use the blue side
00:55:40to remove pencil marks
00:55:41from heavy grades
00:55:42of paper.
00:55:44Most people
00:55:45use bobby pins
00:55:46upside down.
00:55:47The zigzagged part
00:55:48goes closer
00:55:49to your scalp.
00:55:49The texture
00:55:50keeps the hair
00:55:51and pin
00:55:51in place
00:55:52much better.
00:55:53And give your pins
00:55:54a spritz of hairspray
00:55:55before putting them in.
00:55:56They'll grip better.
00:55:58Ever notice
00:55:59the tiny second hole
00:56:00in the lid
00:56:00of your coffee travel mug
00:56:01or to-go cup?
00:56:03It's there
00:56:04to control
00:56:04how smoothly
00:56:05the liquid flows out
00:56:06from the drink hole.
00:56:07Without it
00:56:08the hot stuff
00:56:08would just glug out
00:56:09at you
00:56:10like milk from a jug.
00:56:11It also lets
00:56:12the steam escape
00:56:12so the high temperature
00:56:13and built-up pressure
00:56:15don't melt the lid
00:56:16or send it shooting off.
00:56:19Apples you buy
00:56:20at the supermarket
00:56:20were likely picked
00:56:21between August
00:56:22and November.
00:56:23After that
00:56:24they were covered
00:56:24in wax,
00:56:25hot air dried
00:56:26and stored
00:56:27in cool places.
00:56:28It takes the fruit
00:56:296 to 12 months
00:56:30to make it
00:56:31to fresh produce shelves.
00:56:33Sometimes
00:56:34you need to get away
00:56:35from your computer
00:56:36but don't want
00:56:36to keep logging back in.
00:56:38Put your mouse
00:56:39over the top
00:56:40of an analog watch.
00:56:41The mouse
00:56:42will perceive
00:56:42the ticking
00:56:43second hands movement
00:56:44and this will prevent
00:56:45your computer screen
00:56:46from turning black.
00:56:48When using a blender
00:56:49pour the liquids
00:56:50in it first.
00:56:51Only after adding
00:56:52your milk,
00:56:53coconut water
00:56:54or yogurt
00:56:54put the berries,
00:56:55fruit or spinach inside.
00:56:58Thanks to the holes
00:56:59in the bottoms
00:57:00of earphones
00:57:00air can circulate
00:57:02up and down
00:57:02through the speakers.
00:57:03It results
00:57:04in increased
00:57:04low frequencies.
00:57:06This makes the bass
00:57:07sound deeper
00:57:08and improves
00:57:09the overall sound quality.
00:57:11You can use metal loops
00:57:13on the sides
00:57:13of a grocery cart
00:57:14to organize the space
00:57:15in your cart better.
00:57:16Hang your jacket
00:57:17on such a loop
00:57:18or put a bag
00:57:19of delicate items there
00:57:20like eggs or bread.
00:57:22This way your jacket
00:57:23won't get wrinkled
00:57:23and eggs
00:57:24won't get squished.
00:57:26The black lines
00:57:28on a basketball
00:57:28make the game
00:57:29easier to play.
00:57:31They're actually grooves
00:57:32helping you handle the ball.
00:57:34And since the players
00:57:35need to move around
00:57:36the court while dribbling
00:57:37or bouncing the ball,
00:57:39control is crucial.
00:57:40The black lines
00:57:41allow you to grip
00:57:43the ball better.
00:57:44You can also easily
00:57:45steer it in any direction
00:57:47once it's in your hand.
00:57:48If the basketball
00:57:49was smooth,
00:57:50you wouldn't be able
00:57:51to do it.
00:57:52By the way,
00:57:53pebbled dots
00:57:53that cover the outside
00:57:54of the ball
00:57:55serve the same purpose.
00:57:56The drawer
00:57:57at the bottom
00:57:58of your stove
00:57:58is there to keep
00:57:59your dishes warm
00:58:00when you cook
00:58:01large amounts of food.
00:58:02When one dish
00:58:03is in the oven,
00:58:04the already prepared ones
00:58:05are kept warm
00:58:06in the drawer below.
00:58:09Did you know
00:58:10that you can actually
00:58:11inflate a balloon
00:58:12without using your lungs?
00:58:14All you need
00:58:15is a plastic bottle,
00:58:16vinegar,
00:58:17baking soda,
00:58:18a funnel,
00:58:19a rubber band,
00:58:20and a balloon,
00:58:21of course.
00:58:23First,
00:58:23pull some baking soda
00:58:24into the balloon
00:58:25using your funnel.
00:58:27And now,
00:58:28pour the vinegar
00:58:29into the bottle.
00:58:30You don't need a lot.
00:58:32Just fill about
00:58:33a third of the bottle.
00:58:34Let's go ahead
00:58:35and put the balloon
00:58:36over the bottle.
00:58:38But don't tip the soda
00:58:39inside the vinegar yet.
00:58:41Secure the balloon
00:58:42with a rubber band
00:58:43and tip it over
00:58:44to make the soda
00:58:45fall into the vinegar.
00:58:47And now,
00:58:47you can step back
00:58:48and enjoy the show.
00:58:50When the baking soda
00:58:51and the vinegar
00:58:52are mixed together,
00:58:53they release CO2
00:58:54that will inflate the balloon.
00:58:57You can use
00:58:58the inflated balloon
00:58:59to show your friends
00:59:00another trick.
00:59:01Grab a comb
00:59:02and rub it
00:59:03on the surface
00:59:03of the balloon.
00:59:04Now,
00:59:05you can bend
00:59:05the water flow
00:59:06in your sink
00:59:07with static electricity
00:59:08using your brand new
00:59:10electrified comb.
00:59:11Just don't try
00:59:12brushing your hair.
00:59:14Can you really
00:59:16pierce a balloon
00:59:16without popping it?
00:59:18The answer
00:59:18is yes.
00:59:20You're going to need
00:59:21a skewer
00:59:22or a long needle,
00:59:23a balloon,
00:59:24petroleum jelly,
00:59:25and some courage.
00:59:26Scratch the balloon
00:59:27with your fingers
00:59:28and make it more flexible.
00:59:29Now,
00:59:30blow steadily
00:59:31into the balloon.
00:59:33Stop before
00:59:34blowing it
00:59:34to the full size.
00:59:36This will make
00:59:36the trick easier
00:59:37to perform.
00:59:38Put some petroleum jelly
00:59:39on the needle.
00:59:41Now,
00:59:41find this darker area
00:59:43near the knot
00:59:43where the balloon
00:59:44is less stretched
00:59:45and just pierce it
00:59:47all the way
00:59:47through the top
00:59:48like this.
00:59:50Balloons are made up
00:59:51of polymer chains.
00:59:52They're so tiny
00:59:53that they seem invisible
00:59:54to the human eye.
00:59:55This trick works
00:59:56because the polymer chains
00:59:58are less stretched
00:59:59on the neck
00:59:59of the balloon.
01:00:01It was enough room
01:00:02to allow the needle
01:00:03in between the chains
01:00:04without breaking them.
01:00:05But if you try
01:00:06the same technique
01:00:07on the sides
01:00:08of the balloon,
01:00:09it will definitely pop.
01:00:11By the way,
01:00:13hairspray actually helps
01:00:14keep the air
01:00:15in the balloon longer
01:00:16by sealing the surface.
01:00:17But if you apply
01:00:19hairspray
01:00:19on the outside
01:00:20of the balloon
01:00:21and then touch it
01:00:22when it's not yet dry,
01:00:23the balloon will shrivel.
01:00:25Isn't it magic?
01:00:28Beware,
01:00:29our next trick
01:00:30can make you
01:00:30question gravity.
01:00:32Pour some plain water
01:00:33into a glass bottle.
01:00:35Not much,
01:00:36about a quarter.
01:00:37Put the bottle
01:00:38in the microwave
01:00:39for a minute.
01:00:40Meanwhile,
01:00:41prepare a bowl
01:00:42with colored water
01:00:43to make the trick
01:00:44more visual.
01:00:45Take the bottle
01:00:46out of the microwave,
01:00:47turn it upside down
01:00:48and pour it
01:00:49into the colored water.
01:00:51The bottle will soon
01:00:52begin to fill
01:00:53with water.
01:00:54Can you guess why?
01:00:56The air expands
01:00:57when it's heated.
01:00:58The bottle
01:00:59and the air
01:00:59began to cool down
01:01:01and the air contracted
01:01:02which caused
01:01:03the water to move.
01:01:06Not only wizards
01:01:07can make things disappear.
01:01:09Fill a plastic container
01:01:11or transparent glass
01:01:12with sunflower oil.
01:01:14Dip a glass rod
01:01:16inside the oil.
01:01:17Can you see it now?
01:01:19Oil and glass
01:01:20bend light
01:01:21the same way
01:01:22because they have
01:01:22almost equal
01:01:23refractive indexes.
01:01:25Therefore,
01:01:26it's impossible
01:01:26to see how the wand
01:01:28bends light
01:01:28inside the oil.
01:01:30To make this trick
01:01:31even more epic,
01:01:33pour equal parts
01:01:34of water
01:01:35and oil
01:01:35inside a glass
01:01:36and dip the glass rod
01:01:38inside it.
01:01:39You'll see it
01:01:40in the water
01:01:40but it will disappear
01:01:42inside the oil.
01:01:44have you seen this epic
01:01:46instant freezing trick?
01:01:48Here's how you can
01:01:49repeat it at home.
01:01:50Grab a small plastic bottle
01:01:52of clean drinking water.
01:01:54Leave it for about
01:01:55four hours
01:01:56to bring it to room temperature.
01:01:57And now,
01:01:58put it into a freezer
01:02:00and wait for an hour and a half.
01:02:02After that,
01:02:03take it out
01:02:03very carefully.
01:02:05Try not to shake it
01:02:06at all.
01:02:07Now,
01:02:07hit the bottle strongly
01:02:09or shake it
01:02:10and see what happens.
01:02:12Not only is red cabbage
01:02:14rich in fiber
01:02:15and vitamins,
01:02:16but it's also pretty useful
01:02:17for homemade
01:02:18scientific experiments.
01:02:20Boil red cabbage
01:02:21in pure water
01:02:22and wait
01:02:23until the water
01:02:24gets colored.
01:02:25Red cabbage
01:02:26contains a chemical
01:02:27called anthocyanin.
01:02:29It changes color
01:02:31when it's mixed
01:02:31with an acid
01:02:32or a base.
01:02:33That's why
01:02:34if you mix your cabbage
01:02:35with water
01:02:35with different ingredients,
01:02:37you'll get different colors.
01:02:39Bases like soda
01:02:40will make it blue,
01:02:41but acids
01:02:42on the contrary
01:02:43will create reddish colors.
01:02:45You can prove it
01:02:46by adding some lemon juice
01:02:47to your cabbage water.
01:02:48The water
01:02:49will become pinkish.
01:02:52And if you add vinegar,
01:02:54you'll get an even more
01:02:55vibrant pink color.
01:02:57If you have a juicer,
01:02:59you can try the same experiment
01:03:00with red cabbage juice.
01:03:02Initially,
01:03:03it will have a more
01:03:04vivid purple color,
01:03:05but under the influence
01:03:06of additional liquids,
01:03:08the color will change.
01:03:10Can you guess
01:03:11which color
01:03:11you'll end up with
01:03:12if you mix cabbage juice
01:03:13with bleach?
01:03:14It's almost transparent,
01:03:16but still has
01:03:17a greenish-yellow tinge.
01:03:20The next trick
01:03:21is very trendy
01:03:22among artists.
01:03:23Here's what you're
01:03:24going to need.
01:03:25Liquid soap,
01:03:26cotton buds,
01:03:27milk,
01:03:27and acrylic paints.
01:03:29You can use
01:03:30food coloring
01:03:30for this tip.
01:03:32Pour a little bit
01:03:33of milk into
01:03:34a wide bowl
01:03:35or a plate.
01:03:36You don't need a lot.
01:03:37Then,
01:03:38put a few drops
01:03:38of paint
01:03:39into the milk.
01:03:40And now,
01:03:41dip a cotton bud
01:03:42covered with soap.
01:03:43The patterns
01:03:44will begin to change.
01:03:46That's because
01:03:46the fatty molecules
01:03:47in the milk
01:03:48get attracted
01:03:49to the molecules
01:03:50of soap.
01:03:51When you're satisfied
01:03:52with the pattern,
01:03:53you can put
01:03:54a sheet of paper
01:03:55on top of the milk.
01:03:56And voila,
01:03:57your abstract masterpiece
01:03:58is ready.
01:04:00In fact,
01:04:01this technique
01:04:02is related
01:04:02to an ancient
01:04:03paper marbling
01:04:04called ebery.
01:04:06Artists created
01:04:07colorful patterns
01:04:08by sprinkling
01:04:09and brushing
01:04:09color pigments
01:04:10on a pan
01:04:10of oily water
01:04:12and then transformed
01:04:13those patterns
01:04:14on paper.
01:04:16Friction helps
01:04:17people walk
01:04:18on the road
01:04:18instead of sliding
01:04:19on it.
01:04:20And it also allows
01:04:21us to perform
01:04:22this cool experiment
01:04:23called floating rice.
01:04:26Fill a small
01:04:27plastic bottle
01:04:28with rice.
01:04:29You can use a funnel
01:04:30to make the task easier.
01:04:31Shake the rice
01:04:32for a while
01:04:33and now try to push
01:04:34a chopstick
01:04:35or a pencil
01:04:36inside the bottle.
01:04:37If you did
01:04:38everything right,
01:04:39the stick will get
01:04:40stuck in the rice.
01:04:41You can also try
01:04:42using different types
01:04:43of grains
01:04:44and see what happens.
01:04:46Have you ever tried
01:04:48to put an ice cube
01:04:49into oil?
01:04:49Well, you can try today.
01:04:52It will create
01:04:52these cute little drops
01:04:54that will fall
01:04:54into the bottom
01:04:55of the glass
01:04:56because they're
01:04:56heavier than oil.
01:05:00Here's an easy way
01:05:01to stick an ice cube
01:05:02to a string
01:05:03without any glue.
01:05:04Place an ice cube
01:05:06in water.
01:05:07Put a piece of string
01:05:08on top
01:05:08and sprinkle it
01:05:09with salt.
01:05:10You don't need much
01:05:11otherwise the ice
01:05:13will dissolve.
01:05:13A pinch is enough.
01:05:15Wait for one minute
01:05:17and then gently
01:05:18pull the string
01:05:19and there you go.
01:05:20The ice has stuck
01:05:21to the string.
01:05:24For this experiment,
01:05:26you're going to need
01:05:26an empty,
01:05:27clean soda can.
01:05:28Turn on the kettle
01:05:29and wait until
01:05:30it begins to boil.
01:05:32Carefully hold the can
01:05:33over the kettle
01:05:34using kitchen tongs.
01:05:36It will help fill it
01:05:37with hot steam.
01:05:38When the can
01:05:39is full of steam,
01:05:40give it an ice bath.
01:05:42You can put it
01:05:43into a bowl
01:05:43with cold water
01:05:44and ice cubes.
01:05:46The can should
01:05:47wrinkle up right away.
01:05:48That's because
01:05:49the volume inside
01:05:50the can decreases,
01:05:52reducing its pressure
01:05:53and allowing the
01:05:54external pressure
01:05:55to crush the can.
01:05:57The next trick
01:05:58is also about
01:05:59air pressure.
01:06:00You're going to need
01:06:01a glass bottle,
01:06:02a small piece of paper,
01:06:03a lighter,
01:06:04and a peeled,
01:06:05boiled egg.
01:06:06The diameter
01:06:07of the bottleneck
01:06:08should be less
01:06:09than the width
01:06:10of the egg
01:06:10and it's important
01:06:12to use glass
01:06:13because plastic
01:06:14can melt.
01:06:15Now carefully
01:06:16light the paper,
01:06:18let it burn a little bit
01:06:19and drop it
01:06:20inside the bottle.
01:06:21Put the egg
01:06:22on the neck
01:06:23of the bottle.
01:06:24It should begin
01:06:25to bounce
01:06:25and soon
01:06:26the pressure of air
01:06:28will push the egg
01:06:29into the bottle.
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