- 22 hours ago
Ever wondered why everyday objects have specific features? Discover the fascinating design choices that go beyond aesthetics. We reveal the clever principles behind these items that can help you streamline daily tasks and enhance efficiency. Join us in exploring the genius of design that makes life easier.
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00:00You must have noticed those lines on some kinds of chips.
00:04For one thing, they help with the distribution of spices and seasonings.
00:08In other words, all those substances that make your chips taste like cheese
00:12are mostly stored inside the lines.
00:16Plus, the lines make chips crunchier.
00:20Some cars have a tiny coffee cup sign on their dashboard.
00:24It's the vehicle's anti-drowsiness mechanism.
00:28There are manufacturers that equip their cars with a drowsiness detection system.
00:33It analyzes the speed, wheel angle, and lane deviations
00:37to figure out if it's time for the driver to take a break.
00:41If it is, the vehicle makes several audio signals,
00:44and the coffee cup sign starts to flash.
00:49Some plastic milk containers have dents on their sides.
00:52These dents serve several purposes.
00:56For one thing, when milk spoils, this process usually causes swelling
01:00and high pressure buildup inside the container.
01:04That's when the dent comes in handy.
01:06It pops out and doesn't let the jug blow up.
01:10Plus, if you decide to freeze the milk, it will expand like any other liquid.
01:15And then again, the indentation will pop out
01:18and prevent the container from breaking inside your freezer.
01:22You might have wondered why jerry cans have three handles.
01:26It's a clever designer move.
01:29This way, if you carry the container alone,
01:32you can use only the central handle to distribute the weight evenly.
01:37But if your friend wants to help you out, each of you can grab the side handle.
01:43The first jeans had a problem.
01:45Workers and miners, who were the original jeans wearers,
01:49put too much pressure on the poor piece of clothing.
01:52As a result, the seams couldn't withstand the stress and tore.
01:57Tiny metal studs were invented to prevent this from happening.
02:03Sticky notes come off relatively easily
02:05because their adhesive is spread out across the paper unevenly in small blobs.
02:11And only some of these blobs touch the surface of whatever you've stuck the note on.
02:15That's why when you unstick a post-it and attach it to something else,
02:19it still works until all the glue gets used or covered with dirt.
02:25Soda bottles are always filled in such a way
02:28that there's some space between the liquid and the cap.
02:32That's because soda contains carbon dioxide.
02:36It's a gas that can expand once a bottle is heated.
02:39If there's no gap in the bottle,
02:41it can break because of the pressure building inside.
02:45Also, when you open your drink,
02:48the gases go out in the form of bubbles,
02:50and the drink is likely to overflow.
02:52The gap helps with this problem too.
02:57Dental floss is super useful for your teeth,
02:59but it might be rather hard to operate.
03:02It regularly slips out of your fingers and tangles.
03:06To avoid these problems,
03:08tear off a piece of dental floss and tie its two ends together.
03:12It'll be much easier to use and won't hurt your fingers.
03:17Now, about those horizontal lines on plastic bottles.
03:21They help hold bottles up.
03:24Some bottles are produced from soft plastic.
03:27Without the lines, they wouldn't keep their shape.
03:30Instead, they would twist easily or even break.
03:35The soft round part under a soda bottle cap keeps the carbonation from escaping.
03:41Without it, your pop would go flat in no time.
03:45Probably even before you buy it.
03:49If you don't have anywhere to put a toothpick after using it,
03:52break off its flat end at the first groove and place it on the table.
03:57Now, you can balance the used portion of your toothpick on the grooved part,
04:01so that it doesn't have to touch the table.
04:05You can also make a makeshift stand for disposable chopsticks.
04:09They have a sort of lump on one side.
04:12Break that lump off before you split the pair.
04:16Now, when you want to take a sushi break,
04:18just place the stick on this stand.
04:23Donuts are shaped like rings because otherwise they might get overdone at the edges,
04:28but uncooked and gooey inside.
04:31With a hole in the center, both the outside and the inside get ready at the same time.
04:39Ever notice that layer of clear fluid in gel pens?
04:42It's called the ink follower or stopper fluid.
04:47The gel in such pens contains pigment particles dissolved in a polymer solution.
04:53The gel should be thick enough to keep the pigment particles suspended,
04:57but also thin enough to flow first onto the ball and then the paper.
05:02The main task of the stopper fluid is to be a barrier to prevent the gel from evaporating or leaking
05:08out.
05:09Without this transparent fluid, your gel pen wouldn't function.
05:14The fluid always stays in one position and doesn't get dissolved with the gel.
05:19Neither does it move backward or flow out of the pen.
05:23Some button-down shirts have a button hidden on the back of the collar.
05:28Its main purpose is to prevent the tie from sticking out from under the collar.
05:34As for that locker loop on the back,
05:37you can use it to hang the shirt on a hook to avoid wrinkling it.
05:43Outer rings and zipper sliders, especially when two sliders are used together,
05:48are added so that you can connect them with a lock and keep sticky fingers away.
05:55Most ambulance cars have this word printed on the front of the vehicle.
05:59That's the word ambulance backward.
06:03It's written in reverse so that the driver in front of the ambulance can see the word properly in their
06:08rear-view mirror.
06:10Then they can move out of the way and let the ambulance pass.
06:15Escalator brushes serve an important safety purpose.
06:19You might have heard that most accidents happen after people get their bags or clothes stuck in escalators
06:25because they stand too close to the sides.
06:28But when there are nylon brushes on both sides,
06:31you can't but keep your feet away from the escalator's skirt panels.
06:34The result? No accidents.
06:38The side holes in sneakers are for laces.
06:42Since sneakers were originally invented for basketball players,
06:46this interesting design allowed them to accommodate any player's foot.
06:51They just needed to lace their sneakers in the most comfortable way for them.
06:56The holes in the bottoms of your earphones allow air to circulate up and through the speakers.
07:02It helps to increase low frequencies, making the bass sound deeper.
07:07The quality of the sound also becomes much better.
07:11Ever been stranded with a cup of applesauce but no spoon at hand?
07:17But each snack pack already has a built-in spoon.
07:21Several twists of the foil lid and here you go.
07:26Diamond slits on backpacks were originally placed only on traveler bags.
07:31Their purpose was to carry robes.
07:34These days, you can find such slits on almost every backpack.
07:39Why not use them to carry a bottle of water, an umbrella or a pair of sneakers?
07:46Highlighters are filled with a special semi-transparent fluorescent ink that can glow in dim light.
07:53Yellow and light green hues are the most popular because they don't prevent you from seeing the text after black
07:59and white photocopying.
08:02Photocopiers perceive yellow and light green marks as almost non-existent and don't print them.
08:09A stop sign has an octagonal shape to help drivers recognize it easily, even if they see it from the
08:15back.
08:16When the signs weren't reflective yet, this shape prevented drivers from confusing the stop sign with any other at night.
08:24The number 57 on a Heinz ketchup bottle has nothing to do with the product label.
08:30The truth is that the place with the numbers is the very sweet spot you should tap to get the
08:36ketchup flowing.
08:38So, stop hitting the bottom of your sauce bottle and hit 57.
08:44Lots of private houses have triangular shaped roofs because this allows rain, snow and fallen leaves to slide off the
08:52slope.
08:53If all this stuff piled up on top of your house, one day your roof would collapse.
09:00Airplane windows have rounded edges and that's a crucial safety measure.
09:05It prevents aircraft accidents.
09:08Weak spots are usually situated in the corners.
09:11If airplane windows were square or rectangular, each of them would have four potential weak spots.
09:17Under pressure, they would collapse.
09:23What's hiding inside Coca-Cola cans and regular household batteries?
09:27Why do magnets affect breakfast cereals?
09:31Do crosswalk buttons actually work or are they just useless decorations?
09:36What does that USB symbol really mean?
09:40I'm not sure I know the answers to these and similar questions, but I'm eager to learn the truth together
09:46with you.
09:47Let's find it out.
09:48Coca-Cola cans have a secret few people know about.
09:53Here's a Coke can.
09:54Let's submerge it in a highly corrosive alkaline solution.
09:58The aluminum dissolves due to a process known as hydrolysis and we can see a plastic liner inside the can.
10:05It's made from a polymer or epoxy resin and serves as some kind of a protective barrier between the aluminum
10:11walls of the can and the rather acidic soda.
10:15Despite a popular myth, household batteries don't actually contain liquid.
10:20And if you accidentally cut them open, no toxic liquid will spill.
10:24Most of them are dry cell batteries which are made of electrochemical cells.
10:28Those convert chemical energy into electrical energy.
10:32Larger batteries often house numerous small cells within them too.
10:37Even Tesla vehicle batteries consist of multiple small cells.
10:41When combined, they easily provide the necessary voltage.
10:46Most toothbrushes have differently colored bristles, but they aren't just pleasing to the eye.
10:51Those bristles, often blue, have a functional purpose.
10:55They're called toothbrush indicators and their colors fade as you use the brush.
10:59The American Dental Association recommends changing your toothbrush at least four times a year.
11:05And by getting paler, these bristles help you figure out when it's time to replace your toothbrush.
11:11You'll probably agree that there's no better snack than a pack of chips.
11:15Some are flat, others have ridges.
11:18Is it just aesthetics?
11:20Not really.
11:21The main purpose of those lines on some kinds of chips is to help with the distribution of spices and
11:26seasonings.
11:27In other words, all those substances that make your chips taste like cheese are mostly stored inside the lines.
11:33Plus, the lines make chips crunchier.
11:37Now, this one might be a surprise, but some breakfast cereals are magnetic.
11:42That's because they're often fortified with iron in the form of a fine powder.
11:47Due to the added iron, cereal flakes get attracted to magnets.
11:51All this may sound kinda alarming, but in reality, the iron content in the flakes is minimal and doesn't pose
11:57any threat to your health.
11:59That clear fluid in gel pens is called the ink follower or stopper fluid.
12:04The gel in such pens contains pigment particles dissolved in a polymer solution.
12:09The main task of the stopper fluid is to be a barrier to prevent the gel from evaporating or leaking
12:14out.
12:15Without this transparent fluid, your gel pen wouldn't function.
12:20The fluid always stays in one position and doesn't get dissolved with the gel.
12:25Neither does it move backwards or flow out of the pen.
12:30Many pedestrian crosswalk buttons, namely in New York, are placebo buttons.
12:35They do literally nothing when you press them.
12:38Originally, they were functional after being introduced in 1964, but today, most of them don't affect traffic lights,
12:44which are programmed based on the real needs of the traffic flow.
12:48Why do such buttons even exist, then?
12:51It's a simple psychological trick, providing you with an illusion of control.
12:57You might have noticed that movie theater seats are almost always red.
13:01This choice isn't random.
13:03It has strategic importance, which is rooted in visual science.
13:07The thing is, red light has a longer wavelength.
13:10It means that it's the first color to disappear in low light.
13:13It allows the audience to concentrate better on the screen once the movie begins.
13:17Such a design choice enhances the viewing experience by minimizing distractions.
13:23Speed bumps are crucial for pedestrian safety.
13:26But at the same time, they can seriously increase car emissions due to the non-stop acceleration and deceleration they
13:34cause.
13:35To address this issue, some cities, like London, are testing fake speed bumps.
13:40Those are optical illusions painted on the road.
13:43They look raised from a driver's perspective, but in reality, they're flat.
13:48Authorities hope that this approach will slow down drivers without having a negative impact on the environment.
13:55Soda bottles are always filled in such a way that there's some space between the liquid and the cab.
14:01That's because soda contains carbon dioxide.
14:03It's a gas that can expand once the bottle's heated.
14:06If there's no gap in the bottle, it can break because of the pressure building inside.
14:12Also, when you open your drink, the gases go out in the form of bubbles, making the drink overflow.
14:18The gap helps with this problem, too.
14:22The USB symbol.
14:24Looking like a trident has always sparked multiple speculations about its origin.
14:29One popular idea is that it represents Neptune's trident and symbolizes power and adaptability.
14:35But there's also a little bit less exciting theory.
14:39A man who claimed to have designed the symbol in the 1980s stated that it was supposed to represent connectivity.
14:45The large circle symbolizes a computer, while the attached shapes – the circle, the triangle, and square – stand for
14:52different outputs.
14:56The design of a tennis racket has a specific feature known as the throat.
15:00It's an open space below the head of the racket.
15:04This space isn't just for storing balls, it also improves the racket's aerodynamics by letting air pass through.
15:10It seriously reduces drag during swings.
15:15Speaking of tennis, tennis courts are usually built with a north-south orientation.
15:20It helps minimize the impact of the sun's position during the game, ensuring that neither player has the sun directly
15:26in their eyes.
15:29Look closely at a tram's overhead lines, and you'll see that its contact wires zigzag back and forth instead of
15:36going in a straight line.
15:37That's because all trams have pantographs attached to their roofs.
15:42The upper part of the pantograph is gradually worn down by the overhead wire and eventually needs to be replaced.
15:48To wear it down evenly, the wire is not installed strictly along the tram's path, but in zigzag patterns.
15:56As the tram moves, the pantograph slides along the wire, and it wears down evenly.
16:03Those cone-shaped water cooler cups?
16:06Their shape is intentionally designed to prevent users from setting the cups down.
16:11This allows employees to minimize the risk of spilling water on their desks around various electronic devices.
16:17Plus, less material is used to produce cone-shaped cups, which makes the process less wasteful and more cost-effective.
16:25It also kind of supports sustainability by encouraging people to drink their water quickly and dispose of their cups immediately
16:31after.
16:34Most suitcases have two zipper pulls, and it serves several purposes.
16:39First of all, if one zipper fails, the other can keep the suitcase closed.
16:45Even better, having two zippers allows you to have easier access to small sections of your suitcase without having to
16:51open it entirely.
16:53And finally, when you have two zippers, you can connect them with a padlock for increased security.
17:01Some plastic milk containers have dents on their sides.
17:05These dents serve several purposes.
17:07When milk spoils, it usually causes swelling and high-pressure buildup inside the container.
17:12That's when the dent pops out and doesn't let the jug blow up.
17:16Plus, if you decide to freeze the milk, it will expand like any other fluid.
17:21And then again, the indentation will pop out and prevent the container from breaking inside your freezer.
17:30If you ever had a problem figuring out why fake pockets exist, you need to hear this.
17:35The main reason is that if a clothing item has a specific cut or shape, pockets may spoil it.
17:42They can alter the item's shape either in the warehouse or already on the retail rack.
17:47The solution?
17:48Getting rid of the pockets in key areas.
17:51Plus, fake pockets are obviously cheaper, and they don't get stretched out.
17:57The thermos wasn't actually invented to keep your coffee warm.
18:01It was made by a Scottish scientist who wanted a safe place to keep his chemicals at a stable temperature.
18:08So, he took two bottles, put the smaller one inside the bigger bottle, and vacuumed out the air between them.
18:18Here's how you can protect your bank card from potential fraudsters.
18:21Use a marker and cover the last four digits.
18:24You can also use a sticker that's easy to remove and place it over the security code.
18:29Have you had a house guest that didn't use a coaster?
18:32Get a hair dryer and hold it a couple of inches away from the stain.
18:36Blow it on medium heat for a couple of minutes to evaporate the watermark.
18:40If a faded ring remains, mix equal amounts of vinegar and olive oil in a bowl.
18:44Wipe it onto the marked area and rub it in until the stain disappears.
18:48Then wipe it off.
18:50Don't waste time scrubbing the burnt stains off the bottom of a pan.
18:53Instead, fill it with water and add three tablespoons of salt.
18:57Let it sit overnight as the salt dissolves the burnt marks.
19:00And in the morning, pour the water out of the pan.
19:03This way, it will be much easier to scrub all that grease off.
19:07Picture this.
19:08You're on vacation and your shirt has become all crinkled inside the luggage.
19:12You need it tonight, but the hotel doesn't have an iron.
19:15Don't panic.
19:16Hang the shirt up in the bathroom.
19:17And while you relax in a hot shower, the heat and moisture will unwrinkle your shirt.
19:22It won't be perfect, but it will get much better without any effort.
19:26The football is on, and it turns out you've run out of standard batteries.
19:30You can use a smaller battery instead that easily fits inside.
19:33Now take some aluminum foil and crunch it up.
19:37Fit it into the gap on the negative or flat end of the battery.
19:41All done.
19:41You can turn on the TV now.
19:44Once your flip-flops crack and the plug easily slips out of the hole,
19:47it's normally a sign that you need a new pair.
19:50But there's a way to extend their mileage.
19:52Push the plug back through the hole.
19:54Then take a bread clip and attach it to the end.
19:56The clip will provide enough support for the plug to remain in place.
20:01You've received a package and the receipt is taped on.
20:04You've managed to detach it from the box.
20:06But how to separate the tape without ripping the paper?
20:09Hold both ends of the tape apart, and by pulling it slowly,
20:13the tape stretches and separates itself from the paper without tearing it apart.
20:19Ziploc bags are perfect to keep things dry, but it would be great if they were larger.
20:23Take two and turn one of them inside out.
20:27They can now connect and work as one large bag.
20:30Big enough to protect a keyboard.
20:32There's no need to carry your keys in your hand when you go for a jog.
20:36Instead, put them inside your pocket, take a rubber band,
20:39then tie it around the pocket from the inside.
20:42This stops the keys from falling out.
20:45You've broken your key in the door.
20:47It's stuck. Great!
20:49Arranging for a locksmith could cost up to $100,
20:51but for a cheaper and quicker option, try using a hot glue stick.
20:56Heat the end with a lighter, and once it's warm enough to melt,
20:59push the glue into the keyhole.
21:01The melted glue will enter the available space covering part of the key.
21:05Once it cools, it compresses and gains a strong hold of the key's end.
21:10Now, just pull it out.
21:13If you need to siphon liquid through a hose and want to avoid using your mouth,
21:17put one end in the liquid and hold the other upwards with your thumb closing the top.
21:21Now shake up and down.
21:23This jiggle motion pushes liquid upwards, a little each time.
21:27And once it reaches the top, lower the exit point and let gravity do the rest.
21:32You've left your keys locked inside the car.
21:35It's an older model with a roll-down window.
21:37You could get the coat hanger and begin the long process of finding the lock.
21:41Or use duct tape.
21:42Make about 20 2-foot-long strands.
21:45Stick them onto the window, allowing enough room for the tape to grab onto at the bottom.
21:50Then with a friend, take the ends of the tape, holding them together, and pull downwards.
21:54The force will allow the window to lower enough that you can unlock the door.
21:59While drilling long screws into hardwood, your old drill might not have enough power, leaving them only halfway in.
22:06Before the drill gives up, get a block of wax and scrape the edges of the screws with it.
22:11The wax works like a lubricant, melting as it gets warm and providing easy entry for the screw.
22:18You're out camping, but you didn't bring anything to light the barbecue.
22:21Take a small plastic bag that won't leak, fill it up with water, and close it tight, making a round
22:27bubble.
22:28Hold it over where you want to catch the light from the sun.
22:31The bag of water will work like a magnifying glass, starting up the barbecue, just as long as it's a
22:36sunny day.
22:38Missing a corkscrew or a cork breaking halfway?
22:41By using a stove lighter, heat the top of the bottle.
22:44The heat slightly expands the glass, and this forces the cork out the top.
22:49You've superglued your fingers again.
22:51Take some salt and pour it on top of your stuck fingers.
22:54Put your fingers into the water and slowly rub.
22:57The mixture will dissolve the glue and release you in no time.
23:01While hanging up a painting, it can be impossible to find that stubborn nail.
23:05Place a fork upside down and insert it so the nail is in between the middle fork teeth.
23:10The fork has provided a long arm that's separated from the wall, making it easier to slip the string of
23:16the painting over the nail.
23:18Once it's perfectly balanced, simply remove the fork.
23:23You need to put a cake into a container, but taking it out again later by lifting it up from
23:28the inside might ruin the cake.
23:31Put the lid upside down and place the cake on the lid.
23:34The base of the container is now the lid, making it much easier to access, slice by slice.
23:41Pour out water more efficiently from large jugs and bottles by swirling.
23:45This will make the liquid inside spin, creating a vortex.
23:49The vortex allows for the air to flow back into the bottle as the water pours out.
23:54Much faster than the glugging alternative.
23:58There's an easier and less messy way to remove eggshells from a boiled egg.
24:03Once fully boiled, crack the shell on both ends by tapping them.
24:07On one end, pinch off the shell.
24:09Use the opened end to blow with your mouth.
24:11The force of air will push the flesh and expand the eggshell, forcing out the egg undamaged.
24:19When the hinges of your laptop break, repairing them can cost up to $300.
24:24A far cheaper fix is to buy a picture frame and tape it to the back of the screen.
24:29You've dropped a small piece of jewelry on the floor, seemingly impossible to find.
24:35Take a stocking and place it over the end of the vacuum hose.
24:38Give the area a good vacuum and check the end periodically.
24:41You will eventually find it sitting at the end.
24:44You've drilled a hole in the wall, but the drill hole is now too wide.
24:48Remove the screw and find an object that is slightly shorter and thinner.
24:52Pieces of plastic, small wires, paper clips, or even toothpicks are perfect.
24:57Place whichever item you find inside the hole.
25:00It's filled the gap enough so the screw will now re-enter securely.
25:04Taking the trash out can put you in a gross scenario of getting bin juice on you.
25:09A great way to avoid this is by placing old papers at the bottom of the bag.
25:13Now, not only does it absorb all the liquids from the food and other sources, but also helps prevent bad
25:19smells from forming within a bin.
25:22Nobody likes mosquitoes and pesticides are pricey.
25:25A cheap alternative is to take a plastic bottle and cut the top part off from the bottom of the
25:31funnel.
25:31After removing it, turn it upside down and put it inside the bottle.
25:35Mix two cups of warm water with two tablespoons of sugar.
25:39The mosquitoes will be attracted to the formula inside and become trapped.
25:43Now just sit back and relax without getting bitten.
25:48Have you ever wondered what these extra holes at the top of your running shoes are for?
25:53They're designed so that you can tie the shoes in multiple different ways.
25:57That's useful when you want to compensate for things such as a bad stride or even a damaged toe.
26:04Plus, you can change the look of your shoes the way you prefer.
26:10Many people use a dust jacket of their book as a bookmarker.
26:14No problem with that, it will save your book from bent page corners.
26:17But the primary purpose of a dust cover is to keep the book safe from distortions.
26:23For instance, if you spill juice or drop some of the food on your book while reading it.
26:29The tic-tac dispenser has this little groove on its top.
26:32So you can dispense only one tic-tac at a time.
26:35Even though, let's be honest here, nobody does that.
26:38Most of us just spill a whole bunch at once and then we wiggle all those extra tic-tacs back
26:44in.
26:46Those rubber bumps you see between the tire treads are there for your safety.
26:50The raised edges tell you what the minimum height of your tread is.
26:54If the bump and the edges are even,
26:56it's time for you to visit the tire shop as soon as possible.
27:00But if the bumps are well beneath the level of the edges, you're good to go.
27:06What about that black grating on the microwave window?
27:09It's something called a Faraday shield.
27:12And it's there to prevent microwaves from getting away and turning the entire room into a Faraday cage.
27:18If the microwaves escape, your meal won't cook properly either.
27:22So yep, the cage is not there to make it difficult for you to see your meal while it's cooking.
27:26It's keeping the electromagnetic energy inside.
27:31How about a wrench compatible screwdriver?
27:34Cover your screwdriver with the end of your wrench and you can increase its torque.
27:38That's why the head of your screwdriver is designed the way it is.
27:42When you have odd angles, you can use this strategy.
27:47You've probably heard those myths, the blue side of the eraser can erase the pen.
27:51False.
27:52Its purpose is to erase a pencil, but in case you're writing something on heavier paper.
27:58The blue side can remove smudges you see after using the pink eraser too.
28:04Have you ever wondered why oranges in supermarkets mostly come in the red mesh bag?
28:09It's a trick to make this food look more orange and encourage you to make a purchase.
28:14An extra tip, don't throw away the mesh bag.
28:17Tie it up so you can have a small pot scrubber to clean your sink, kitchen, appliances and dishes.
28:25You can see golf balls don't have a perfectly round shape.
28:29Their surface is covered with many little dimples, something golf balls didn't always have.
28:34At one point, experienced golfers started noticing how through time, older balls with imperfections, such as nicks and bumps, could
28:43travel further.
28:45Such things create turbulence in the air around the golf ball, which eventually reduces drag.
28:51So, manufacturers started producing balls with dimples so they could go farther and faster.
28:58You might have noticed that sometimes there are ridges in toothpick tops.
29:02It's more hygienic because when you break that off, you can prop the toothpick up on it and it won't
29:08touch anything.
29:11Another safety feature you'll find, this time in your car, is a tab on your rear view mirror.
29:17With it, you can change the position of the mirror so you don't get blinded if there's a car behind
29:22you with its high beams on.
29:24So, this little tab helps you control the glare of lights coming from behind.
29:28This feature showed up in the 1930s, but in the early 1970s, it became a part of standard equipment in
29:35most trucks and cars.
29:38Do you see that tiny hole on your iPhone right next to the rear-facing camera?
29:43It's a microphone, and it's there so your phone can record sound as you turn your camera around.
29:51Some cables have a thick cylinder towards the end of the cord.
29:54It's called a ferrite core, or a choke.
29:58It's a magnetic iron oxide that stops high-frequency electromagnetic interference.
30:03For example, you know that annoying static noise you get if you bring your phone too close to a speaker?
30:09This interrupts your call, which is why cable cords with big cylinders are pretty useful, because they prevent these things.
30:18Do you know why nearly all luggage bags and backpacks have two zippers?
30:22It's way more convenient and easier to open in that way.
30:26But not just that.
30:27You can also lock these two zippers together to keep the stuff inside your bags safer.
30:34You know how toilets at public spots like malls have those big gaps at the bottom?
30:39It's primarily for better circulation of air.
30:42This type of door also makes it easier to clean the toilet or check if it's occupied if you're standing
30:48in line.
30:49Other than that, if you get stuck there and the lock gets broken, you still have a way to escape.
30:55You can just crawl out.
30:58Ever notice those plastic end caps on utility knives?
31:02And they also have scales on them, which indicates you may use them multiple times, but with sharp edges.
31:10You can separate the blades through these plastic end caps.
31:13Then, you can move the slider and bring the sharp blade to the front.
31:17If you've ever taken a moment to examine a regular grocery cart, especially their fold-out section,
31:24you probably noticed those metal loops jutting out.
31:27They're designed to protect the items you carry in your cart.
31:31You can use them to hang bags with soft items.
31:35You don't want to accidentally squish with heavier products, like bread.
31:39Or easily breakable things, like eggs.
31:43Many coffee mugs come with curved notches on their bottom.
31:46When you're washing your mugs, put them against the rack at an angle in your dishwasher.
31:51This way, the water won't pool in there, so your favorite cup will be completely dry by the time you
31:56take it out of the dishwasher.
31:59If you're a McFlurry fan, you've probably noticed there's a square hole in the handle of the spoon.
32:05It's there so you can attach it to the special machine that mixes the ice cream and your favorite toppings
32:10together.
32:11The machine has a bar that slips into this square-shaped spoon and then thoroughly stirs it.
32:17And you get the spoon so they can minimize the mess during the process.
32:22Quite neat, wouldn't you say?
32:25A regular milk jug has a dent on one side.
32:28Some might see it as a random design decision, but a dent has several purposes.
32:34One of them is to get bigger if there's a gas buildup.
32:37This happens when your milk is spoiled.
32:40So you don't even have to try to check this out.
32:43Also, the dent is there so the jug doesn't burst if you accidentally drop it.
32:48The dent allows the expansion space that deals with the sudden pressure that happens when you drop the jug.
32:55Dental floss
32:56Sure, it's important for your dental health, and it's easy to assume what you do with it.
33:01But dental floss is great in the kitchen as well, because it's a very precise cake slicer.
33:07Way better than a regular knife.
33:12Most kitchen shears have a serrated opening right there at the center where the blades and handles meet.
33:18It's something you can use to trim difficult herbs such as rosemary, thyme, or chives.
33:24Because of this opening, you don't need to pick the leaves off by hand, but de-stem them in one
33:29motion.
33:31The majority of gelatin containers or single serving yogurts come with a tin foil lid.
33:36And in most cases, you can use this covering as a disposable spoon.
33:41Just peel away the covering and after a couple of simple folds, you'll have a perfect little spoon for your
33:47midday snack.
33:47We'll be back.
33:49We'll be back.
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