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Discover the surprising capabilities of everyday items like toilet paper that can save the day in unexpected situations. We explore common household objects to reveal their secret functions that you’ll wish you had known sooner. Get ready to transform how you view these mundane items forever!
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00:00Okay, I know it's kind of cold to the touch, especially on a freezing winter's day,
00:04but did you know that brass doorknobs actually serve a purpose apart from looking classy and
00:08shiny? Since it's a copper alloy, brass has antimicrobial properties. That means it can
00:14help get rid of harmful germs and bacteria, sometimes in up to two hours. In high-traffic
00:19areas, that's all the more useful, but since brass is much costlier than other metals like
00:24nickel and steel, you barely see these types of doorknobs anymore nowadays. Speaking of lovely
00:30multi-purpose items, most screwdrivers have a tiny little secret of their own. They can sometimes
00:35be slid through a wrench so that they can be used to create more torque when twisting,
00:39not to mention the uses when it comes to bolts in hard-to-reach places.
00:44There's a reason why buttons on women's shirts are for the left-handed, and it has nothing to do
00:49with fashion. This practice dates back to the times when chambermaids were helping ladies dress
00:54themselves, and it was easier for them to perform their job with this orientation. Having the buttons
01:01placed as such indicated a sign of wealth, so it's easy to imagine why the practice carried on,
01:06even though most people dress themselves nowadays. Next time you receive a package in your mail,
01:12take a look at your box cutter. If it features some diagonal lines on the blade,
01:16you're in for a little design perk. Turns out that these are blades that snap off.
01:22Continuously cutting cardboard can dull the sharp edge of the blade. To help prevent the need to
01:26buy a brand new box cutter, the top segment along the next line can be broken off to reach a
01:31new sharp
01:32edge. To do this, check out the small hole at the base of the tool, sometimes called the blade snapper.
01:39The people that first came up with this brilliant invention were engineers inspired by the way
01:43chocolate bars are segmented. Hold on a minute, don't throw away the cardboard package just yet.
01:49Most likely, you'll have some silica gel packets somewhere at the bottom of the box.
01:53Since this gel is basically a drying tool, it gathers up the moisture out of its environment,
01:58so you can store these packets for further occasions. Whether you'll need to dry out your phone
02:03or some other electrical object, you can place them in a container next to the silica gel
02:08to reduce the damage. You don't have to be a mechanic to know when a standard car tire needs
02:13replacing, since they come equipped with a neat indicator. Take a closer look, and you'll see that
02:19treads within the tire are a bunch of rubber notches. When the treads are evened out with the
02:24perpendicular bars, it's a sign you need to book an appointment with your local car service,
02:29since most likely the tires have lost most of their traction and may not be safe for driving any
02:34longer. The upper corners of a car windshield feature textured black dots melted into the glass
02:40edges. This neat add-on isn't there for design purposes. It's called Frit Glazing, which means
02:47that a special type of ceramic paint is added to the window for protecting its sealant from UV rays.
02:53It also conceals and creates a coarser surface for the adhesive used to set the window in place.
03:00Whenever you're up for a drive, check out if there's a small tab under your car's rearview
03:06mirror. Bet you didn't know it's there to help switch the mirror from daytime to nighttime views.
03:12It uses a prismatic glass technology to blur the reflection and reduce the glare of headlights
03:18behind you in traffic. People came up with these manually tilted mirrors in the 1930s,
03:23but they became standard somewhere in the 1970s. While you're in the car, check out the headrests,
03:30as you most likely don't know that they carry a little disguised purpose. Of course, they're
03:35adjustable to accommodate passengers of any height so that they get the proper support for their heads
03:39and necks. The hidden feature is that they are detachable and come with two very solid metal bars.
03:46Should you ever find yourself stuck in a car and need to make a fast getaway?
03:50These bars come in handy to crack out the car windows.
03:54So you're out for a drive and you're suddenly out of gas.
03:58What I'm about to describe sounds more like a meme than an actual situation bound to happen.
04:02But what if you're in such a hurry that you accidentally drive off with the gas nozzle still in the
04:08tank?
04:09Well, the nozzles have been designed to prevent any hazards from happening, rest assured.
04:14They feature a breakaway device that will allow the hose to separate when taken out with enough force.
04:20Initially designed in the early 20th century to be worn exclusively by basketball players,
04:26sneakers soon became one of those fashion fundamentals, similar to jeans and leather jackets.
04:31If you take a closer look at them, you'll see they have two extra holes on the side,
04:35similar to the shoelace holes.
04:37They're manufactured as such not only to provide extra ventilation,
04:41but to allow people to get extra creative with their laces when wearing the shoes.
04:46Admit it, you've always thought that chopsticks are merged at the end for the sole purpose of keeping them together
04:51until you're ready to dig into your meal.
04:53That may or may not be the whole truth.
04:56Under a more detailed inspection, the wooden tools feature a square-shaped end.
05:00Chopsticks manufactured like this date back to an old Japanese traditional design,
05:06which can help with breaking the ends easily.
05:08The separated end can then be used as a resting block for the chopsticks
05:12to keep it more sanitized in hopes it can be used again,
05:15since they won't be touching the table or any other surface.
05:20Women's bikes have a special design,
05:22which, surprisingly, has a historical and fashionable purpose.
05:26The lower frame is for the most part meant to make up for the generally shorter height of ladies,
05:31compared to that of the average gentleman.
05:33While that is the case for handlebars and saddles,
05:36the overall frame is lower for an additional purpose.
05:39Way back when women wore long skirts and dresses all day,
05:43every day they needed to make sure their outfits wouldn't get caught in the frame.
05:47That's how we came up with a lower-framed bicycle,
05:50perfectly made for women and their needs at the time.
05:54The fact that toothpastes are multicolored
05:57is not just a nice perk to make dental hygiene more fun.
06:00There's a secret meaning related to each of the colors,
06:02which dates back to the 1970s.
06:05In those days, people grew more and more interested in their oral health care,
06:10and as such, they were looking for products
06:12which could do more than merely clean their teeth.
06:15One company was the pioneer in that regard,
06:18adding mouthwash to its toothpaste, meaning the blue strip.
06:21They later added on the red strip,
06:24meant to feature ingredients which helped with gum care.
06:27Speaking of toothpaste,
06:29check the cap next time you open a new tube.
06:31You may be in for a little surprise.
06:34There's a pointed cone shape inside the cap,
06:36so you can puncture the seal of the toothpaste
06:38without cutting yourself or ruining your manicure.
06:41Not to mention, it's more hygienic
06:43since you won't be able to transfer germs
06:45or other bacteria into the product itself.
06:48On the subject of bathroom countertop items,
06:52toothbrushes come with a neat add-on hidden in the bristle patterns.
06:55Apart from making the toothbrush look cooler,
06:58they also do come with a practical purpose.
07:01Most toothbrushes come with a pattern of blue bristles
07:03intertwined with white ones.
07:05The blue dye is meant to fade out,
07:07signaling the time when you need to replace your toothbrush.
07:11Dentists say that toothbrushes should be replaced
07:13every three to four months,
07:15but it does serve as a great reminder in case you forget.
07:18Still love playing with Lego?
07:20Don't judge.
07:21Hey, it's a great hobby for all ages.
07:23Notice there's a hole on top of the Lego heads?
07:26Behold, you're looking at a safety feature
07:28that the people at Lego designed to prevent choking hazards.
07:32The most dangerous issue should a person swallow any of these pieces
07:36is the blocking of the airways.
07:38Designing a hole inside the Lego head
07:41helps the air to flow freely through the piece
07:43until it can be removed safely.
07:46We're now used to all sorts of modern light bulbs,
07:49some tubular, some shaped like diamonds,
07:51and some even twisted all together.
07:54Historically, light bulbs were round
07:56and the initial shape served a purpose in itself.
07:59It was mainly connected to the fact that glass bulbs were hand-blown,
08:03which gave them the round shape to begin with.
08:05The hidden practical reason was that the light bulb filament
08:08needed to be at the same distance
08:10from every surface of the glass sphere.
08:12The easiest way to achieve this
08:14was to make the glass in the shape of a globe.
08:19Did you know that you can actually inflate a balloon
08:22without using your lungs?
08:24All you need is a plastic bottle,
08:26vinegar, baking soda,
08:27a funnel,
08:29a rubber band,
08:30and a balloon, of course.
08:33First, pull some baking soda into the balloon
08:35using your funnel.
08:37And now, pour the vinegar into the bottle.
08:40You don't need a lot.
08:42Just fill about a third of the bottle.
08:45Let's go ahead and put the balloon over the bottle.
08:48But don't tip the soda inside the vinegar yet.
08:51Secure the balloon with a rubber band
08:53and tip it over to make the soda fall into the vinegar.
08:56And now you can step back and enjoy the show.
09:00When the baking soda and the vinegar are mixed together,
09:03they release CO2 that will inflate the balloon.
09:07You can use the inflated balloon to show your friends another trick.
09:11Grab a comb and rub it on the surface of the balloon.
09:14Now you can bend the water flow in your sink with static electricity
09:18using your brand new electrified comb.
09:21Just don't try brushing your hair.
09:25Can you really pierce a balloon without popping it?
09:28The answer is yes.
09:30You're going to need a skewer or a long needle,
09:33a balloon, petroleum jelly,
09:35and some courage.
09:36Scratch the balloon with your fingers
09:38and make it more flexible.
09:40Now, blow steadily into the balloon.
09:43Stop before blowing it to the full size.
09:45This will make the trick easier to perform.
09:48Put some petroleum jelly on the needle.
09:51Now, find this darker area near the knot
09:54where the balloon is less stretched
09:55and just pierce it all the way through the top, like this.
10:00Balloons are made up of polymer chains.
10:02They're so tiny that they seem invisible to the human eye.
10:05This trick works because the polymer chains
10:08are less stretched on the neck of the balloon.
10:11It was enough room to allow the needle
10:13in between the chains without breaking them.
10:15But if you try the same technique
10:17on the sides of the balloon,
10:19it will definitely pop.
10:22By the way,
10:23hairspray actually helps keep the air
10:25in the balloon longer by sealing the surface.
10:27But if you apply hairspray
10:29on the outside of the balloon
10:31and then touch it when it's not yet dry,
10:33the balloon will shrivel.
10:35Isn't it magic?
10:38Beware, our next trick can make you question gravity.
10:42Pour some plain water into a glass bottle.
10:45Not much, about a quarter.
10:47Put the bottle in the microwave for a minute.
10:50Meanwhile, prepare a bowl with colored water
10:53to make the trick more visual.
10:55Take the bottle out of the microwave,
10:57turn it upside down,
10:59and pour it into the colored water.
11:01The bottle will soon begin to fill with water.
11:04Can you guess why?
11:06The air expands when it's heated.
11:08The bottle and the air began to cool down
11:11and the air contracted,
11:12which caused the water to move.
11:16Not only wizards can make things disappear.
11:19Fill a plastic container or transparent glass
11:22with sunflower oil.
11:24Dip a glass rod inside the oil.
11:27Can you see it now?
11:29Oil and glass bend light the same way
11:32because they have almost equal refractive indexes.
11:35Therefore, it's impossible to see
11:37how the wand bends light inside the oil.
11:40To make this trick even more epic,
11:43pour equal parts of water and oil inside a glass
11:46and dip the glass rod inside it.
11:49You'll see it in the water,
11:51but it will disappear inside the oil.
11:55Have you seen this epic instant freezing trick?
11:58Here's how you can repeat it at home.
12:00Grab a small plastic bottle of clean drinking water.
12:04Leave it for about four hours
12:06to bring it to room temperature.
12:08And now, put it into a freezer
12:10and wait for an hour and a half.
12:12After that, take it out very carefully.
12:15Try not to shake it at all.
12:16Now, hit the bottle strongly
12:19or shake it and see what happens.
12:22Not only is red cabbage rich in fiber and vitamins,
12:26but it's also pretty useful
12:27for homemade scientific experiments.
12:30Boil red cabbage in pure water
12:32and wait until the water gets colored.
12:35Red cabbage contains a chemical called anthocyanin.
12:39It changes color when it's mixed with an acid or a base.
12:43That's why if you mix your cabbage with water
12:45with different ingredients,
12:47you'll get different colors.
12:49Bases like soda will make it blue,
12:51but acids on the contrary will create reddish colors.
12:55You can prove it by adding some lemon juice
12:57to your cabbage water.
12:59The water will become pinkish.
13:02And if you add vinegar,
13:04you'll get an even more vibrant pink color.
13:07If you have a juicer,
13:09you can try the same experiment with red cabbage juice.
13:12Initially, it will have a more vivid purple color,
13:15but under the influence of additional liquids,
13:18the color will change.
13:20Can you guess which color you'll end up with
13:22if you mix cabbage juice with bleach?
13:25It's almost transparent,
13:27but still has a greenish-yellow tinge.
13:30The next trick is very trendy among artists.
13:33Here's what you're gonna need.
13:35Liquid soap, cotton buds, milk, and acrylic paints.
13:39You can use food coloring for this tip.
13:42Pour a little bit of milk into a wide bowl or a plate.
13:46You don't need a lot.
13:47Then, put a few drops of paint into the milk.
13:50And now, dip a cotton bud covered with soap.
13:54The patterns will begin to change.
13:56That's because the fatty molecules in the milk
13:58get attracted to the molecules of soap.
14:01When you're satisfied with the pattern,
14:03you can put a sheet of paper on top of the milk.
14:06And voila, your abstract masterpiece is ready.
14:10In fact, this technique is related to an ancient paper marbling
14:14called ebri.
14:16Artists created colorful patterns by sprinkling and brushing color pigments
14:20on a pan of oily water
14:22and then transformed those patterns on paper.
14:26Friction helps people walk on the road instead of sliding on it.
14:30And it also allows us to perform this cool experiment called floating rice.
14:36Fill a small plastic bottle with rice.
14:39You can use a funnel to make the task easier.
14:42Shake the rice for a while.
14:43And now, try to push a chopstick or a pencil inside the bottle.
14:47If you did everything right, the stick will get stuck in the rice.
14:51You can also try using different types of grains and see what happens.
14:56Have you ever tried to put an ice cube into oil?
15:00Well, you can try today.
15:02It will create these cute little drops that will fall into the bottom of the glass
15:06because they're heavier than oil.
15:10Here's an easy way to stick an ice cube to a string without any glue.
15:15Place an ice cube in water.
15:17Put a piece of string on top and sprinkle it with salt.
15:20You don't need much, otherwise the ice will dissolve.
15:23A pinch is enough.
15:26Wait for one minute and then gently pull the string.
15:29And there you go.
15:30The ice has stuck to the string.
15:34For this experiment,
15:35you're going to need an empty, clean soda can.
15:38Turn on the kettle and wait until it begins to boil.
15:42Carefully hold the can over the kettle using kitchen tongs.
15:46It will help fill it with hot steam.
15:48When the can is full of steam, give it an ice bath.
15:52You can put it into a bowl with cold water and ice cubes.
15:56The can should wrinkle up right away.
15:59That's because the volume inside the can decreases,
16:02reducing its pressure and allowing the external pressure to crush the can.
16:07The next trick is also about air pressure.
16:11You're going to need a glass bottle,
16:12a small piece of paper,
16:13a lighter and a peeled, boiled egg.
16:16The diameter of the bottleneck should be less than the width of the egg.
16:20And it's important to use glass because plastic can melt.
16:25Now carefully light the paper,
16:28let it burn a little bit and drop it inside the bottle.
16:31Put the egg on the neck of the bottle.
16:34It should begin to bounce.
16:36And soon, the pressure of air will push the egg into the bottle.
16:42Some pieces of clothing come with a small patch of fabric with a button on it.
16:46While it's quite obvious how to use the button,
16:49the fabric's purpose isn't so apparent.
16:51It's not there to patch holes.
16:53You're supposed to test your cleaning products on it.
16:56Then, if something goes wrong, you won't ruin the whole garment.
17:00The seemingly random dime-sized hole in the elevator door is actually a keyhole.
17:05If the elevator doors get stuck,
17:07an operator can open them manually by inserting a special key in this hole.
17:12The same tool is used when an elevator needs routine maintenance.
17:16Some plastic milk containers have dents in their sides that serve several purposes.
17:21For one, if milk spoils,
17:22this process can cause swelling and high-pressure buildup inside the container.
17:27That's when the dent comes in handy.
17:29It pops out and doesn't let the jug blow up.
17:32Plus, if you decide to freeze the milk,
17:34it'll expand like any other liquid.
17:36And then again,
17:37the indentation will pop out and prevent the container from bursting inside the freezer.
17:42A first-timer might think that Chinese takeaway boxes have a peculiar shape.
17:47The more experienced diners know that by unfolding the sides of these containers,
17:51you get a paper plate with the food already sitting on top.
17:55The lines on plastic solo cups can help you measure out liquids and non-liquids too.
18:00From the bottom up, those lines coincide with the measurements of 1, 5, and 12 ounces.
18:06The lowermost line is the perfect portion of mouthwash.
18:10The middle one is a serving of cereal for breakfast.
18:13And the topmost is the amount of water recommended to drink 4 to 5 times a day.
18:19Striped toothpaste will always come out in stripes even if you mash the tube with all your strength.
18:24No magic involved though.
18:26The product is very dense and viscous, so it doesn't mix well.
18:30The white, blue, and red parts of the toothpaste are pushed down at an even rate,
18:34thanks to their similar physical properties.
18:37And viscosity helps the stuff be pushed down and out from the edges first.
18:41So no matter how hard you try, there will always be those perfect stripes.
18:47Not every iPhone owner pays attention to an almost unnoticeable little hole between the camera and the flash.
18:53It's the gadget's second microphone.
18:56Its role is to block outside noises when you're filming a video.
19:00This microphone also makes the sound clearer.
19:02Use it when you're on the phone in a noisy place.
19:05Dental floss can slip out from your fingers and tangle.
19:08To avoid such problems, tear off a piece and floss and tie its two ends together.
19:13It will be much easier to use and won't hurt your hands.
19:18Most frying pans have holes in their handles.
19:20You can use it to hang the thing on a hook on the wall, but that's not its original purpose.
19:24When you're cooking something in the pan, the hole in the handle is there to hold your messy spoon.
19:30It's especially important for plastic utensils because you can't leave them in the pan for long since they can melt.
19:37Some toothpicks have several grooves on the blunt end.
19:40When you need to use one, break off the grooved end and put it on the table.
19:44It'll serve as a rest to keep your toothpick from touching the surface.
19:49You've probably noticed that most soft-rink lids have ridges and three bumps on them.
19:54With their help, the lid can turn into a coaster once you put it on the table and place the
19:58cup on top of it.
19:59No more spillage.
20:01Bath foam isn't only for fun or a nice smell.
20:04It also helps regulate the temperature.
20:08The bubbles keep the water hot so you can enjoy a bath a bit longer.
20:12Anyway, it works for acrylic bathtubs only.
20:15Those made of metal lose heat really fast either way.
20:18Almost all measuring tapes have a metal tip with a small slot on the end.
20:23You can use this slot to hang the tape on a nail or a screw to make measurements without anyone's
20:28help.
20:29Sometimes this tip has a row of sharp points along the edge on one side.
20:33That comes in handy when you want to leave a mark without using a pencil.
20:38A pack of cotton pads has those strings on it so we could hang it on some hook or holder.
20:44And no, there's no need to untighten and tighten the pack again.
20:47Look at the bottom of the pack.
20:49It has a perforated line.
20:51Tear along that and now you're good to pull out a cotton pad.
20:55A triple handle on a jerry can is there to make it easier for two people to carry it and
20:59distribute the fuel evenly.
21:01Gas cans often have a second hole that actually needs to be uncapped too before you pour the gas.
21:07The air passage will prevent it from pouring out.
21:10Lemons get juicier if you warm them up a little bit in the microwave.
21:14The heat softens the frozen membranes so the juice can flow out freely.
21:18More lemonade for you!
21:20When you buy some grated cheese, get ready for a surprise.
21:23If the package says it contains cellulose, it means that the cheese does contain wood pulp.
21:29Don't worry, it's digestible.
21:32It's added to prevent the product from clumping.
21:35The expiration date on mineral water isn't about water going bad.
21:40Actually, no water can spoil, but the bottle can.
21:43Over time, it starts leaking some chemicals that aren't quite safe.
21:48The spike in the cap of a tube of ointment or cream is there so you can puncture the tiny
21:52foil seal.
21:53No need to grab a toothpick or try to use your fingernails to peel it off.
21:58Post-it notes are supposed to be peeled off from the side, like you're turning the page in a book.
22:03Most of us tear them from the bottom, and that just creates a crease and makes the whole note less
22:08sticky.
22:09To prevent water from boiling over, just lay a wooden spoon across the rim of the pot.
22:14It only works for a little while, though.
22:16If the spoon's surface gets heated up to the boiling point, the bubbles will just foam up and around it.
22:21That's why metal spoons won't do.
22:24They heat up too quickly.
22:26Some erasers have two colors and textures.
22:29Not for pen ink versus pencil lead, but for different types of paper.
22:33You're supposed to use the blue side to remove pencil marks from heavy grades of paper.
22:39Most people use bobby pins upside down.
22:42The zigzagged part goes closer to your scalp.
22:44The texture keeps the hair and pin in place much better.
22:48And give your pins a spritz of hairspray before putting them in.
22:51They'll grip better.
22:53Ever notice the tiny second hole in the lid of your coffee travel mug or to-go cup?
22:58It's there to control how smoothly the liquid flows out from the drink hole.
23:02Without it, the hot stuff would just glug out at you like milk from a jug.
23:06It also lets the steam escape so the high temperature and built-up pressure don't melt the lid or send
23:11it shooting off.
23:14Apples you buy at the supermarket were likely picked between August and November.
23:18After that, they were covered in wax, hot air dried, and stored in cool places.
23:23It takes the fruit 6 to 12 months to make it to fresh produce shelves.
23:28Sometimes, you need to get away from your computer but don't want to keep logging back in.
23:33Put your mouse over the top of an analog watch.
23:36The mouse will perceive the ticking second-hands movement.
23:39And this will prevent your computer screen from turning black.
23:43When using a blender, pour the liquids in at first.
23:46Only after adding your milk, coconut water, or yogurt, put the berries, fruit, or spinach inside.
23:53Thanks to the holes in the bottoms of earphones, air can circulate up and down through the speakers.
23:58It results in increased low frequencies.
24:01This makes the bass sound deeper and improves the overall sound quality.
24:06You can use metal loops on the sides of a grocery cart to organize the space in your cart better.
24:11Hang your jacket on such a loop or put a bag of delicate items there, like eggs or bread.
24:17This way your jacket won't get wrinkled and eggs won't get squished.
24:21The black lines on a basketball make the game easier to play.
24:26They're actually grooves, helping you handle the ball.
24:29And since the players need to move around the court while dribbling or bouncing the ball, control is crucial.
24:35The black lines allow you to grip the ball better.
24:38You can also easily steer it in any direction once it's in your hand.
24:43If the basketball was smooth, you wouldn't be able to do it.
24:47By the way, pebbled dots that cover the outside of the ball serve the same purpose.
24:51The drawer at the bottom of your stove is there to keep your dishes warm when you cook large amounts
24:56of food.
24:57When one dish is in the oven, the already prepared ones are kept warm in the drawer below.
25:05What's hiding inside Coca-Cola cans and regular household batteries?
25:09Why do magnets affect breakfast cereals?
25:12Do crosswalk buttons actually work or are they just useless decorations?
25:18What does that USB symbol really mean?
25:21I'm not sure I know the answers to these and similar questions, but I'm eager to learn the truth together
25:27with you.
25:28Let's find it out.
25:30Coca-Cola cans have a secret few people know about.
25:34Here's a Coke can.
25:35Let's submerge it in a highly corrosive alkaline solution.
25:39The aluminum dissolves due to a process known as hydrolysis, and we can see a plastic liner inside the can.
25:46It's made from a polymer or epoxy resin and serves as some kind of a protective barrier between the aluminum
25:52walls of the can and the rather acidic soda.
25:57Despite a popular myth, household batteries don't actually contain liquid, and if you accidentally cut them open, no toxic liquid
26:05will spill.
26:06Most of them are dry cell batteries which are made of electrochemical cells.
26:10Those convert chemical energy into electrical energy.
26:14Larger batteries often house numerous small cells within them, too.
26:18Even Tesla vehicle batteries consist of multiple small cells.
26:22When combined, they easily provide the necessary voltage.
26:28Most toothbrushes have differently colored bristles, but they aren't just pleasing to the eye.
26:33Those bristles, often blue, have a functional purpose.
26:36They're called toothbrush indicators, and their colors fade as you use the brush.
26:41The American Dental Association recommends changing your toothbrush at least four times a year.
26:46And by getting paler, these bristles help you figure out when it's time to replace your toothbrush.
26:53You'll probably agree that there's no better snack than a pack of chips.
26:57Some are flat, others have ridges.
26:59Is it just aesthetics?
27:01Not really.
27:02The main purpose of those lines on some kinds of chips is to help with the distribution of spices and
27:07seasonings.
27:08In other words, all those substances that make your chips taste like cheese are mostly stored inside the lines.
27:15Plus, the lines make chips crunchier.
27:19Now, this one might be a surprise, but some breakfast cereals are magnetic.
27:23That's because they're often fortified with iron in the form of a fine powder.
27:28Due to the added iron, cereal flakes get attracted to magnets.
27:32All this may sound kind of alarming, but in reality, the iron content in the flakes is minimal and doesn't
27:38pose any threat to your health.
27:41That clear fluid in gel pens is called the ink follower or stopper fluid.
27:45The gel in such pens contains pigment particles dissolved in a polymer solution.
27:51The main task of the stopper fluid is to be a barrier to prevent the gel from evaporating or leaking
27:56out.
27:57Without this transparent fluid, your gel pen wouldn't function.
28:01The fluid always stays in one position and doesn't get dissolved with the gel.
28:06Neither does it move backwards or flow out of the pen.
28:11Many pedestrian crosswalk buttons, namely in New York, are placebo buttons.
28:16They do literally nothing when you press them.
28:19Originally, they were functional after being introduced in 1964, but today, most of them don't affect traffic lights,
28:26which are programmed based on the real needs of the traffic flow.
28:30Why do such buttons even exist, then?
28:32It's a simple psychological trick, providing you with an illusion of control.
28:38You might have noticed that movie theater seats are almost always red.
28:43This choice isn't random.
28:44It has strategic importance, which is rooted in visual science.
28:48The thing is, red light has a longer wavelength.
28:51It means that it's the first color to disappear in low light.
28:55It allows the audience to concentrate better on the screen once the movie begins.
28:59Such a design choice enhances the viewing experience by minimizing distractions.
29:05Speed bumps are crucial for pedestrian safety.
29:08But at the same time, they can seriously increase car emissions due to the non-stop acceleration and deceleration they
29:15cause.
29:17To address this issue, some cities, like London, are testing fake speed bumps.
29:21Those are optical illusions painted on the road.
29:24They look raised from a driver's perspective, but in reality, they're flat.
29:29Authorities hope that this approach will slow down drivers without having a negative impact on the environment.
29:37Soda bottles are always filled in such a way that there's some space between the liquid and the cab.
29:42That's because soda contains carbon dioxide.
29:45It's a gas that can expand once the bottle's heated.
29:48If there's no gap in the bottle, it can break because of the pressure building inside.
29:54Also, when you open your drink, the gases go out in the form of bubbles, making the drink overflow.
29:59The gap helps with this problem, too.
30:04The USB symbol.
30:05Looking like a trident has always sparked multiple speculations about its origin.
30:11One popular idea is that it represents Neptune's trident and symbolizes power and adaptability.
30:17But there's also a little bit less exciting theory.
30:21A man who claimed to have designed the symbol in the 1980s stated that it was supposed to represent connectivity.
30:26The large circle symbolizes a computer, while the attached shapes – the circle, the triangle, and square – stand for
30:34different outputs.
30:37The design of a tennis racket has a specific feature known as the throat.
30:42It's an open space below the head of the racket.
30:45This space isn't just for storing balls.
30:48It also improves the racket's aerodynamics by letting air pass through.
30:52It seriously reduces drag during swings.
30:56Speaking of tennis, tennis courts are usually built with a north-south orientation.
31:01It helps minimize the impact of the sun's position during the game, ensuring that neither player has the sun directly
31:08in their eyes.
31:10Look closely at a tram's overhead lines, and you'll see that its contact wires zigzag back and forth instead of
31:17going in a straight line.
31:19That's because all trams have pantographs attached to their roofs.
31:23The upper part of the pantograph is gradually worn down by the overhead wire and eventually needs to be replaced.
31:30To wear it down evenly, the wire is not installed strictly along the tram's path, but in zigzag patterns.
31:38As the tram moves, the pantograph slides along the wire, and it wears down evenly.
31:45Those cone-shaped water cooler cups?
31:48Their shape is intentionally designed to prevent users from setting the cups down.
31:52This allows employees to minimize the risk of spilling water on their desks around various electronic devices.
31:59Plus, less material is used to produce cone-shaped cups, which makes the process less wasteful and more cost-effective.
32:06It also kind of supports sustainability by encouraging people to drink their water quickly and dispose of their cups immediately
32:13after.
32:16Most suitcases have two zipper pulls, and it serves several purposes.
32:21First of all, if one zipper fails, the other can keep the suitcase closed.
32:26Even better, having two zippers allows you to have easier access to small sections of your suitcase without having to
32:33open it entirely.
32:35And finally, when you have two zippers, you can connect them with a padlock for increased security.
32:43Some plastic milk containers have dents on their sides.
32:46These dents serve several purposes.
32:49When milk spoils, it usually causes swelling and high-pressure buildup inside the container.
32:54That's when the dent pops out and doesn't let the jug blow up.
32:58Plus, if you decide to freeze the milk, it will expand like any other fluid.
33:03And then again, the indentation will pop out and prevent the container from breaking inside your freezer.
33:11If you ever had a problem figuring out why fake pockets exist, you need to hear this.
33:16The main reason is that if a clothing item has a specific cut or shape, pockets may spoil it.
33:23They can alter the item's shape either in the warehouse or already on the retail rack.
33:28The solution?
33:30Getting rid of the pockets in key areas.
33:32Plus, fake pockets are obviously cheaper, and they don't get stretched out.
33:38The thermos wasn't actually invented to keep your coffee warm.
33:43It was made by a Scottish scientist who wanted a safe place to keep his chemicals at a stable temperature.
33:49So, he took two bottles, put the smaller one inside the bigger bottle, and vacuumed out the air between them.
33:59Many shirts have two buttons on the cuffs, but only one buttonhole.
34:04So, what is the second button for?
34:07Turns out you can use it whenever you're wearing a watch, so the cuff is looser.
34:13Most clothing items you buy come with a small bag of fabric, or a button, or both.
34:19Buttons obviously can be used as a replacement if you lose the original ones.
34:23Pieces of fabric can be used to patch up a hole, but, most importantly, it's a tester.
34:29You can use it to test different washing products on it and see what happens to the fabric.
34:35Some umbrellas have a tip at the top, and it turns out it's not just a pretty design.
34:42When going inside on a rainy day, you should just close your umbrella and tap the tip against the floor
34:47to drain the water faster and more effectively.
34:51Many backpacks have this diamond with two parallel cut-out slits on its front, and it's there for your comfort.
34:59You can attach something to it, like a water bottle or shoes.
35:03It comes especially handy if you travel somewhere or go hiking, so you don't have to hold your stuff.
35:10Okay, the next thing is gear loops, and probably from the name of it, you already have an idea what
35:16they're there for.
35:17You can strap in some useful gear you need to have with you, like trekking poles or shovels.
35:23Some gear will need to be secured to do it.
35:26Drop the handle through the loop and rotate it upward.
35:29Then, secure it with the elastic hook at the top, and you're golden.
35:34On the back of many makeup and hygiene products, you can find this symbol with a marking, like 6M, 12M,
35:42and 24M.
35:44This is the number of months this product can serve after you open it and before you should throw it
35:50out.
35:52The two sides of a cotton pad are different because each of them has a particular purpose.
35:58A cotton pad has several layers to ensure that it's soft, strong, and can absorb liquids.
36:04The edge is stitched to hold it all together.
36:08The smooth side of a pad is for applying products, like tonics and lotions.
36:12And the embossed side is best for cleansing and makeup removal.
36:18Also, any pack of cotton pads has those strings on the sides.
36:22They're there so you can hang the package somewhere.
36:25Then, you can open the package at the bottom, where the perforated line is, and take them out.
36:32Did you know that there is an efficient way to pull a thread from yarn?
36:36When you pull from the outside, the yarn rolls away, so you need to hold it.
36:40However, if you pull it from the center, it will stay together.
36:45We're all familiar with staplers, but I bet you don't know all its secrets.
36:50Most staplers have a compartment to store spare staples, which can be located either on top or at the bottom.
36:58Also, surprise!
37:00This metal plate you press staples against can be turned around.
37:04This way, the device will be able to staple your documents by turning the metal ends outwards.
37:11No need to wonder whether you need to get a smaller or bigger container.
37:15Turns out, plastic food containers have volume measurements on their bottoms, indicating how much food they can fit.
37:23Ceiling fans come with a small switch on the inside of the blade.
37:26You might not have noticed it because it's not in plain sight, so check yours out.
37:31This switch allows you to change the direction of rotation.
37:35Now, why would you want to do that?
37:38The blades of a fan push the air in different directions, depending on the way they rotate.
37:43In the summer, you need the air to be pushed down to create the effect of a breeze.
37:49In the winter, the direction should be changed so that the air is pushed towards the ceiling.
37:54It then heats up before going down the walls.
37:59Have you noticed that the gas tank sign on car's dashboards has a little arrow next to it?
38:06Well, this arrow has a purpose.
38:08It points at the side of the car where the gas tank is located.
38:12It's very useful for forgetful people who constantly wonder where the gas tank is,
38:17and also for those who drive rentals once in a while.
38:20The answer is right in front of your eyes.
38:22If you can't find the arrow on your panel, then the fuel hose on the icon indicates the side instead.
38:31All car tires have 12-digit numbers printed on them,
38:35and they're actually important codes for car owners if they want to get the right tire.
38:40The first letter identifies the type of tire.
38:43P stands for a tire for light passenger cars, and LT is for heavy vehicles.
38:49Then, the following numbers stand for the width of the tire, its radial, and its diameter.
38:57Measuring tapes have that metal stud on the end,
39:00which you can use to attach the tape to the surface you measure.
39:04This way, you don't need to hold it yourself.
39:07But there's also a small slot, which can be used to hang the tape on a nail,
39:11again to free your hands and keep measuring.
39:15The bottom of the end of the tape has a ridged edge.
39:19It will help you make a mark if you don't have a marking tool with you.
39:24On the tape, there are black diamonds that are placed every 19.2 inches.
39:29They're useful for construction workers when spacing engineering joists.
39:33They can also be useful for you if you want to hang something heavy, for example.
39:39The diamond will mark the exact center of a wooden joist.
39:43Those are placed 16 inches apart from one another.
39:46There, you can drill something to that center
39:49to make sure whatever you hang is safely attached to the joist
39:52instead of the unreliable thin wall.
39:55Pictures will survive, but it's particularly important if you're hanging something heavy.
40:01Did you know that batteries have an expiration date?
40:05Yes, it's printed right on their label, but I've never noticed it before.
40:10The expiration date doesn't mean you can't use it after that.
40:14It's more like a recommended usage period,
40:18after which the manufacturer can't guarantee full battery life
40:22due to deteriorated components.
40:26These little feet keyboards have are actually a standard.
40:31The height of a keyboard should be adjustable,
40:34allowing the angle between 0 degrees and 15 degrees.
40:39The reason to fold the feet out is for you to see the keys better,
40:44in case you don't type blindly.
40:46A little problem that comes with it is that, in this case,
40:50your wrists are bent,
40:52and it's not good to keep them in this position for a long time.
40:58Pans have those holes on the ends of their handles.
41:01They're not just there for you to hang them.
41:03You can also place your cooking spoon in there.
41:07It'll hang right above the pan,
41:09and the sauce will not spill around.
41:12Make sure to tap off the sauce or food beforehand, though,
41:16so that it doesn't go down the spoon's handle.
41:21Stickers with numbers you can find on fruits
41:23can tell you some information on how the food was grown.
41:28A four-digit code that starts with a four
41:31means that the fruit was grown conventionally,
41:35meaning it contains chemicals and pesticides.
41:38So, your best choice should be a fruit with a five-digit number.
41:43And if you see the number 9,
41:46it indicates that the fruit is certified organic.
41:50On the bottom of plastic bottles,
41:53you can often notice a mark of a triangle
41:56with a number engraved in the middle.
41:59This number specifies the type of plastic
42:02that was used to produce the bottle.
42:05These codes help people and local recycling centers
42:09to sort returns.
42:11Products that were made of plastic of types 1 and 2
42:15are the easiest ones to recycle.
42:18Plastics of types 3 through 7 are tougher to recycle.
42:25Leaving your valuables or a chocolate bar in a car
42:28is a no-brainer.
42:29But there are other things people often overlook.
42:32Here's what to watch out for before leaving your car.
42:36Number 1 is aerosol cans.
42:39Hairspray, deodorant, spray paint,
42:41household cleaner and that sort.
42:43On the back of these cans,
42:45you might notice a storage temperature recommendation.
42:48Well, stick to that.
42:50Here's what can happen.
42:51Since these cans are pressurized,
42:53they become more sensitive to temperature.
42:56What's inside the aerosol may expand
42:58and this may result in a crack.
43:00And then, the can can blow up.
43:03Temperatures above 100 degrees Fahrenheit
43:05are already alarming.
43:07And it can easily get as hot as that in your car
43:09on a warm summer day.
43:12Researchers from the USA have figured out
43:14how long it takes a car
43:16to turn into a sweat factory on a hot day.
43:21Within 1 hour,
43:23the insides of the car parked in the sun
43:25reaches 95 degrees Fahrenheit or hotter
43:28with an average temperature of 116 degrees Fahrenheit.
43:32So, if you want your car in one piece and running,
43:35take aerosol cans with you.
43:39The second item is sunscreen.
43:43Sunscreen is vital for your skin
43:45since it decreases the risk of skin complications
43:47and prevents skin aging caused by the sun.
43:51This includes wrinkles, sagging, and age spots.
43:55But when you leave sunscreen in your car,
43:57it gets exposed to high temperatures
43:59and it can ultimately shorten its shelf life.
44:02If you end up finding spoiled sunscreen,
44:05you might notice a funny smell when you open the cap.
44:08Plus, the heat might cause the cap to open
44:10and the sticky substance will get all over the car.
44:13The same rule applies to lipsticks
44:15and other cosmetics as well.
44:19The next one is plastic bottles.
44:22There are two reasons why you shouldn't leave them
44:24inside your car.
44:26Firstly, a plastic water bottle can act as a lens,
44:29magnifying the sun's rays and starting a fire.
44:33A fire department in Oklahoma conducted an experiment
44:37and confirmed that the danger of fire was real.
44:39David Richardson from that department says
44:42it can happen if the beam of light is focused enough.
44:46The second reason is related to your health.
44:49Many plastic bottles contain bisphenol,
44:51a potentially toxic compound.
44:53The BPA levels can increase at high temperatures
44:56and that can be harmful to your body.
44:59There's a chance that this chemical can get into your drink
45:02after you leave the bottle inside the vehicle.
45:06Oh, and batteries!
45:07They could lose their capacity to work at full power
45:10when they're left abandoned in the car.
45:12You can buy a new pair and fix this problem,
45:15but it won't be as easy to solve the problem
45:17of leakage or a rupture.
45:19It can be bad for your health
45:21because battery acid is dangerous
45:23when inhaled and highly corrosive.
45:26The reason for leakage is again
45:28related to high temperatures.
45:30Battery manufacturers recommend keeping their products
45:33at room temperature.
45:36This fact is partially related to batteries.
45:39It's about electronics.
45:40Have you ever realized how hot your phone can get
45:43when it's exposed to the sun?
45:45You're driving and, let's say,
45:47looking at the GPS on your phone.
45:49Even in this situation, your phone can heat up.
45:52What will happen to it after hours of sun exposure?
45:56Phone companies are strongly against customers
45:58leaving their devices in vehicles
46:00because they might shut down, get damaged,
46:03or, you know, boom!
46:06Personal belongings are another priority on the list.
46:09A wallet or a handbag may come to one's mind first.
46:13Yet, a passport or even some change
46:16you leave near the passenger seat
46:17is sometimes enough to attract a thief.
46:20Better to keep such stuff out of sight,
46:22for example, by storing it in the trunk
46:25instead of leaving it in the back seat.
46:29Number 7 is also related to theft.
46:32Life can be too hectic sometimes.
46:34And it's understandable if you can't clean your car frequently.
46:37But leaving garbage in the car is another mistake.
46:40Thieves tend to search for messy-looking cars.
46:43They think that the owner doesn't use such a vehicle frequently.
46:48How about plants?
46:51I know, it isn't that common to keep plants in the car on a daily basis.
46:55But sometimes, you need to move them.
46:58The heat inside the vehicle can easily dehydrate the poor thing.
47:03Medications are another thing you shouldn't keep in the car for too long.
47:07The constantly changing temperatures inside the vehicle
47:10can decrease the effectiveness of your pills.
47:13Authorities recommend keeping most medications
47:16at 59 to 77 degrees Fahrenheit in a cool and dry place.
47:22Important documents that contain your personal data
47:25shouldn't be left in the vehicle either.
47:27Some examples of such documents are tax forms,
47:31financial statements, and school transcripts.
47:33A thief could commit fraud or identity theft
47:36using this valuable information.
47:40And there's also food and drinks.
47:42Experts recommend not leaving groceries or leftovers
47:45in a warm car for more than two hours
47:48or only an hour when it's over 90 degrees Fahrenheit.
47:51The same rule applies in the winter too.
47:55Canned foods, for example, have a high risk of going bad
47:58if a can of sweet peas, let's say, gets frozen in the car.
48:02The effect will be similar to what would happen to soda.
48:05Let it thaw in the refrigerator instead of leaving it at room temperature.
48:10If the product doesn't look or smell normal,
48:13throw it away in a place where not even an animal can find it.
48:16Don't try to taste it, just trust your senses.
48:19If the item seems rusted or there are some cracks in the can,
48:23it should end up in the trash too.
48:26Eggs are another example.
48:28Normally, eggs shouldn't be frozen.
48:30But let's suppose you forgot one grocery bag in the trunk of the car
48:33and the weather was so cold at night that the eggs got frozen.
48:37Keep the eggs in the refrigerator before use.
48:39They should be hard cooked.
48:41It's your only option.
48:43You see, freezing causes the yolk to become thick and syrup-like.
48:47It loses that natural flow and doesn't mix well with other ingredients.
48:53You shouldn't leave your pets alone in the car, obviously.
48:56And not just because of a potential rise in temperature.
49:00They will feel uncomfortable without you, their best friend, accompanying them.
49:04In their frustration, they might do something to get noticed,
49:07which can be, for example, ruining the interior of the vehicle.
49:13Now let's return to the winter season again.
49:15If possible, keep the gas tank of your car over half full.
49:19This can prevent the fuel lines from freezing.
49:22It also makes it easier to start the engine and hit the road in the morning.
49:26While keeping an eye on the fuel bar,
49:28it might be a good idea to glance at the tire pressure too.
49:31The cold can result in tire pressure drops.
49:36Not only high, but also low temperatures can damage some items.
49:40A good example is paint cans.
49:43They should be quickly taken out of the vehicle in the winter.
49:46The ingredients in the paint can experience expansion, separation, and clumping due to the cold.
49:52In other words, you won't be able to use this paint anymore.
49:57Weather also affects wooden musical instruments like violins or guitars.
50:02Changes in temperature and humidity can cause wooden instruments to warp, crack, or split.
50:10Glasses get affected by fluctuating temperatures too.
50:13In a hot car, plastic frames can bend.
50:16Or plastic can become brittle when it's very cold.
50:19This makes glasses prone to breaking.
50:22Don't leave house keys and garage door openers inside the car.
50:26This is an everyday practice for many people, but it's risky.
50:29They can get into the wrong hands.
50:33To listen to music, most people connect their phones to the car or listen to the radio.
50:39CDs are getting less and less used these days.
50:42But don't leave them in the car anyway.
50:43They might get warped, and you won't be able to use them anymore.
50:47Can you think of any other items you shouldn't leave in the car?
50:52Okay, today I'll show you things you've never seen and tell you stuff you never knew.
50:58Wow, all in one video!
50:59What a bargain!
51:00For example, these soda found stations in fast food restaurants.
51:04We all see the nice side of it, but have you ever wondered where all this soda comes from?
51:09Let me take you behind the scenes.
51:12Ta-da!
51:13Turns out it's a pile of boxes with tubes.
51:16So when the drink runs out, the employees change the box and plug the tube back in.
51:21Okay, let's peek into a couple more places where we normally don't belong.
51:26This is, for example, what you will see if you cut the screen of a Mac open.
51:31And here's what's hidden behind the dryers in a public laundromat.
51:35Today, 4 out of 5 households in the U.S. have a dryer.
51:39But they weren't so widely accessible when they first appeared in the 1950s,
51:43because they were way too expensive for the average homeowner.
51:47Now, grocery shopping isn't an uncommon practice.
51:50And we all have walked past dairy fridges a million times.
51:53But have you ever wondered what's behind them?
51:56Turns out they're just shelves, and store employees stack the products from the other side.
52:01It makes perfect sense, but I never imagined it like this.
52:05Now, this photo shows what's behind the elevator button.
52:08Obviously, a bunch of cords.
52:10The buttons are all wired to a computer that manages the elevator.
52:14How does the computer know where the elevator is at a particular time?
52:18Well, there are several possible systems.
52:20But the most common one is a long vertical tape in the shaft with a series of holes.
52:26A sensor counts the number of holes that are passed, and that's how the location is determined.
52:32Okay, there are a couple of common things we all know, but the purpose of which remains a mystery to
52:38most.
52:38So let me share these secrets with you.
52:41Those metal rivets on jeans have been there from the very beginning.
52:45Jacob Davis, the iconic man who made the first pair of jeans, added copper rivets to places where pants are
52:52most likely to rip.
52:54Today, they have more of a decorative and distinctive purpose, since they are a traditional attribute of the jeans everyone
53:00knows of.
53:01Now, I'll bet you know there are extra loops on some shoes.
53:05No, they're not for sweat or ventilation.
53:07Those are extra loops for laces, just like other loops you use.
53:11But they're there to tie your shoe around the ankle to prevent your foot from moving aside.
53:17That's especially helpful if you're hiking and ascending and descending hills and trails.
53:22Now, have you ever noticed those half-belt thingies many coats and jackets have at the back?
53:28Turns out they first appeared on oversized military jackets.
53:31So the extra fabric could be collected on the back, and the person doesn't stumble when working.
53:37Today, those belts are only added for the sake of style and tradition.
53:41Most clothing items you buy come with a small bag of fabric or a button, or both.
53:47These are actually not useless.
53:49Buttons obviously can be replaced if you lost the original one.
53:53Pieces of fabric can serve two purposes.
53:55You can patch up the hole, but the main purpose is to provide you with a sample of cloth,
54:00so you can use it to test different washing products on it and see what happens to the fabric.
54:06Now, pom-poms on woolen hats.
54:09Did you know that sailors were wearing hats with pom-poms in the 18th century
54:13to protect their heads in case they accidentally whacked them?
54:17Regular people were wearing them in Scotland,
54:19and the color of the pom-pom signified the person's social status.
54:23People got back to wearing hats with those cute decorative items during the Great Depression.
54:28They're made of spare yarn, so it was a cheap way to decorate your hat.
54:32Now, if you haven't noticed, some sidewalks have little plates with bumps on them.
54:38Most people don't pay much attention to them, but they're very important for visually impaired people.
54:43It signals a slope that then leads to a crosswalk.
54:47Also, several patterns signal different things.
54:49Have you noticed that the icon of a gas tank on car dashboards has a little arrow next to it?
54:56Well, the arrow has a purpose.
54:58It points at the side of the car where the gas tank is located.
55:02Very useful for forgetful people, like me, who constantly wonder which side it is on,
55:07and also for those who drive rentals once in a while.
55:10The answer is right in front of your eyes.
55:13If you can't find the arrow on your panel, then the fuel hose on the icon indicates the side instead.
55:20Now, on the back of many makeup and hygiene products, you'll find this symbol with a marking like 6M, 12M,
55:27and 24M.
55:28This is the number of months this product can serve you before you should toss it out.
55:33You might know that whistles work perfectly fine, even if they don't have that ball inside.
55:38And yet, they have it.
55:40But why?
55:41Even though there's a sound without the ball, the noise it creates is very flat, and it's not distinguishable enough.
55:48When the whistle has a ball inside, then it starts moving with every blow, indicating different pitches and making the
55:55noise more noticeable.
55:57Lollipop sticks have those squared holes on the end of their sticks for a reason, too.
56:01When the candy is put on the stick, some of it goes into the hole, fixating the candy part.
56:08This way, the candy ball, or whatever shape, is less likely to fall off the stick.
56:13Yeah, it's a bummer when that happens.
56:15Measuring tapes have that little metal stud on the end.
56:19Most people know that you can use it to stick it to the side of the surface you're measuring.
56:23But it's not the only cool thing about it.
56:26Look, there's also a small slot.
56:28And this slot can be used to hang it on a nail.
56:31Again, to free your hands and keep measuring.
56:34The bottom of the end of the tape has a ridged edge.
56:37It'll help you make a mark if you don't have a marking tool with you.
56:41Have you ever wondered why the tape's blade is curved?
56:44Well, it helps to keep it rigid when extended.
56:47Pay a closer look at the blade.
56:50Apart from numbers and markings, there are also black diamonds.
56:53Those are there every 12.2 inches, and they're useful for construction workers to space engineering joists.
57:01They can also be useful for you if you want to hang something heavy, for example.
57:06The diamond will mark the exact center of a stud, which is placed 16 inches apart from one another.
57:12And you can drill something to that center to make sure whatever you hang is safely attached.
57:18Now, most coins have ridges.
57:20And this is the legacy of the olden days.
57:23You see, back in the day, all coins were linked to a silver standard.
57:27The amount of silver used in a coin was proportionate to the value of the coin.
57:32So, the more actual silver was used to make the coin, the higher its value was.
57:37Hi-ho silver!
57:38Do you remember the Lone Ranger?
57:40Silver was the name of his horse.
57:42Eh, never mind.
57:43Anyway, all the coins had precious metal in them, and some people started shaving off a little bit of silver
57:50from it.
57:51It wasn't noticeable on one, but if done on several, people could get quite a bit of that precious metal.
57:57So, to prevent fraud, the edges were made with ridges for security reasons.
58:03So, if someone attempted to shave it off, the ridges would disappear, and no one would accept that coin anymore.
58:09Smart!
58:10Today, no one makes coins out of silver.
58:12The coins just represent the value.
58:15But the ridges are kind of a cultural heritage now.
58:18And finally, a typical plastic milk jug often has inverted circles on one or more of the sides.
58:24Not like alien crop circles, this dimple is there to make the jug more resistant and to prevent it from
58:31erupting in case the jug falls on the floor.
58:34The dimple gives some more space for the liquid to expand.
58:37Also, as the expiration date approaches, the microbes in the milk start to expel some gases.
58:43As there are more of them trapped inside, the pressure in the jug is rising.
58:47The dimple takes care of the expansion and prevents the jug from exploding.
58:51And the cows are utterly delighted that their hard work is not wasted.
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