- 15 hours ago
Discover how to extend the life of your everyday items with innovative techniques hidden in plain sight. Unveil the 'internal maintenance' features and clever designs that manufacturers don't want you to know about. From secret mechanisms in office tools to surprising elements in kitchen gadgets, learn the original purposes behind these inventions. Don't let poor habits lead to premature failure—this deep dive reveals the engineering secrets you need to know.
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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.
03:22They 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, you can use it to hang the shirt on a hook to
05:40avoid 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, you can't but keep your feet away from the escalator's skirt
06:34panels.
06:35The 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.
07:03It helps to increase low frequencies, making the bass sound deeper.
07:07The quality of the sound also becomes much better.
07:12Ever 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.
07:38Why 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 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.
09:18Under pressure, they would collapse.
09:22Okay, today I'll show you things you've never seen and tell you stuff you never knew.
09:28Wow, all in one video! What a bargain!
09:30For example, these soda found stations in fast food restaurants.
09:34We all see the nice side of it, but have you ever wondered where all this soda comes from?
09:39Let me take you behind the scenes.
09:42Ta-da!
09:43Turns out it's a pile of boxes with tubes.
09:46So, when the drink runs out, the employees change the box and plug the tube back in.
09:51Okay, let's peek into a couple more places where we normally don't belong.
09:56Hehe.
09:56This is, for example, what you will see if you cut the screen of a Mac open.
10:01And here's what's hidden behind the dryers in a public laundromat.
10:05Today, four out of five households in the U.S. have a dryer.
10:09But they weren't so widely accessible when they first appeared in the 1950s.
10:13Because they were way too expensive for the average homeowner.
10:17Now, grocery shopping isn't an uncommon practice.
10:20And we all have walked past dairy fridges a million times.
10:23But have you ever wondered what's behind them?
10:26Turns out, they're just shelves.
10:28And store employees stack the products from the other side.
10:31It makes perfect sense, but I never imagined it like this.
10:35Now, this photo shows what's behind the elevator button.
10:38Obviously, a bunch of cords.
10:40The buttons are all wired to a computer that manages the elevator.
10:44How does the computer know where the elevator is at a particular time?
10:48Well, there are several possible systems.
10:51But the most common one is a long vertical tape in the shaft with a series of holes.
10:56A sensor counts the number of holes that are passed.
10:59And that's how the location is determined.
11:02Okay, there are a couple of common things we all know.
11:05But the purpose of which remains a mystery to most.
11:08So, let me share these secrets with you.
11:11Those metal rivets on jeans have been there from the very beginning.
11:15Jacob Davis, the iconic man who made the first pair of jeans,
11:20added copper rivets to places where pants are most likely to rip.
11:24Today, they have more of a decorative and distinctive purpose
11:27since they are a traditional attribute of the jeans everyone knows of.
11:31Now, I'll bet you know there are extra loops on some shoes.
11:35No, they're not for sweat or ventilation.
11:37Those are extra loops for laces, just like other loops you use.
11:41But they're there to tie your shoe around the ankle to prevent your foot from moving aside.
11:47That's especially helpful if you're hiking and ascending and descending hills and trails.
11:52Now, have you ever noticed those half-belt thingies many coats and jackets have at the back?
11:58Turns out, they first appeared on oversized military jackets.
12:01So, the extra fabric could be collected on the back and the person doesn't stumble when working.
12:07Today, those belts are only added for the sake of style and tradition.
12:11Most clothing items you buy come with a small bag of fabric or a button or both.
12:17These are actually not useless.
12:19Buttons obviously can be replaced if you lost the original one.
12:22Pieces of fabric can serve two purposes.
12:25You can patch up the hole, but the main purpose is to provide you with a sample of cloth.
12:30So, you can use it to test different washing products on it and see what happens to the fabric.
12:36Now, pom-poms on woolen hats.
12:38Did you know that sailors were wearing hats with pom-poms in the 18th century to protect their heads in
12:45case they accidentally whacked them?
12:47Regular people were wearing them in Scotland, and the color of the pom-pom signified the person's social status.
12:53People got back to wearing hats with those cute decorative items during the Great Depression.
12:58They're made of spare yarn, so it was a cheap way to decorate your hat.
13:03Now, if you haven't noticed, some sidewalks have little plates with bumps on them.
13:07Most people don't pay much attention to them, but they're very important for visually impaired people.
13:13It signals a slope that then leads to a crosswalk.
13:17Also, several patterns signal different things.
13:20Have you noticed that the icon of a gas tank on car dashboards has a little arrow next to it?
13:26Well, the arrow has a purpose.
13:28It points at the side of the car where the gas tank is located.
13:31Very useful for forgetful people, like me, who constantly wonder which side it is on, and also for those who
13:39drive rentals once in a while.
13:40The answer is right in front of your eyes.
13:43If you can't find the arrow on your panel, then the fuel hose on the icon indicates the side instead.
13:49Now, on the back of many makeup and hygiene products, you'll find this symbol with a marking like 6M, 12M,
13:57and 24M.
13:58This is the number of months this product can serve you before you should toss it out.
14:03You might know that whistles work perfectly fine even if they don't have that ball inside.
14:08And yet, they have it.
14:10But why?
14:11Even though there's a sound without the ball, the noise it creates is very flat, and it's not distinguishable enough.
14:18When the whistle has a ball inside, then it starts moving with every blow, indicating different pitches and making the
14:25noise more noticeable.
14:27Lollipop sticks have those squared holes on the end of their sticks for a reason, too.
14:32When the candy is put on the stick, some of it goes into the hole, fixating the candy part.
14:38This way, the candy ball or whatever shape is less likely to fall off the stick.
14:43Yeah, it's a bummer when that happens.
14:45Measuring tapes have that little metal stud on the end.
14:49Most people know that you can use it to stick it to the side of the surface you're measuring.
14:53But it's not the only cool thing about it.
14:56Look, there's also a small slot.
14:58And this slot can be used to hang it on a nail.
15:01Again, to free your hands and keep measuring.
15:04The bottom of the end of the tape has a ridged edge.
15:07It'll help you make a mark if you don't have a marking tool with you.
15:11Have you ever wondered why the tape's blade is curved?
15:14Well, it helps to keep it rigid when extended.
15:17Pay a closer look at the blade.
15:19Apart from numbers and markings, there are also black diamonds.
15:24Those are there every 12.2 inches.
15:27And they're useful for construction workers to space engineering joists.
15:31They can also be useful for you if you want to hang something heavy, for example.
15:35The diamond will mark the exact center of a stud, which is placed 16 inches apart from one another.
15:42And you can drill something to that center to make sure whatever you hang is safely attached.
15:48Now, most coins have ridges.
15:50And this is the legacy of the olden days.
15:53You see, back in the day, all coins were linked to a silver standard.
15:57The amount of silver used in the coin was proportionate to the value of the coin.
16:02So, the more actual silver was used to make the coin, the higher its value was.
16:07Hi-ho silver!
16:08Do you remember the Lone Ranger?
16:10Silver was the name of his horse.
16:12Eh, never mind.
16:13Anyway, all the coins had precious metal in them.
16:17And some people started shaving off a little bit of silver from it.
16:21It wasn't noticeable on one.
16:23But if done on several, people could get quite a bit of that precious metal.
16:28So, to prevent fraud, the edges were made with ridges for security reasons.
16:33So, if someone attempted to shave it off, the ridges would disappear and no one would accept that coin anymore.
16:39Smart!
16:40Today, no one makes coins out of silver.
16:42The coins just represent the value.
16:45But the ridges are kind of a cultural heritage now.
16:47And finally, a typical plastic milk jug often has inverted circles on one or more of the sides.
16:55Not like alien crop circles.
16:57This dimple is there to make the jug more resistant and to prevent it from erupting in case the jug
17:02falls on the floor.
17:04The dimple gives some more space for the liquid to expand.
17:07Also, as the expiration date approaches, the microbes in the milk start to expel some gases.
17:13As there are more of them trapped inside, the pressure in the jug is rising.
17:17The dimple takes care of the expansion and prevents the jug from exploding.
17:22And the cows are utterly delighted that their hard work is not wasted.
17:30A label on your panties digging into your most sensitive spots is definitely not the best feeling.
17:37Sure, you can cut it off, but often that just leaves even sharper corners that can be more annoying.
17:43But what if you've been cutting those labels wrong this whole time?
17:46Check it out.
17:47On the left, the label is sewn into the seam.
17:50While on the right, it's just hanging on by a couple of threads.
17:54Just snip those threads.
17:55And voila!
17:57It's like the label was never even there.
17:59Plus, with this little hack, you can always pick panties in the store that are guaranteed to be comfy.
18:05If you've traveled to Europe recently, you may have noticed how nasty the bottle caps have become.
18:11Yeah, according to the law, they now have to scratch your nose.
18:15Oops, sorry, they have to be attached right to the bottle.
18:18If these bottles annoy you too, try this.
18:20Once you open the bottle, rotate the cap 90 degrees and pull until one of the plastic connections breaks.
18:28And finally, turn the bottle until the cap touches your chin, not your nose.
18:32And drink!
18:34You've been using the colander in the wrong way all this time.
18:37This smart kitchen device has a hidden function.
18:40The traditional way of draining noodles involves dumping boiled noodles into a colander, right?
18:45But if your colander is about the same size as your pot, try this instead.
18:51Place the colander on top of the pot with the noodles, like a lid, and drain the water out.
18:57This method is faster and less messy.
18:59And it keeps your noodles in the pot where they belong.
19:04Toilet plungers and sink plungers are quite different.
19:08And the toilet version has a handy rubber flap called a flange that pops out from the cup.
19:12This flange fits snugly over toilet drains, giving you strong suction to tackle stubborn clogs.
19:20While a sink plunger won't help with toilet troubles, the toilet plunger can work on your sink or tub.
19:26Just make sure to keep that flap tucked inside the cup.
19:30And don't forget to give it a thorough clean with bleach before switching from toilet to sink use.
19:35You definitely don't want to mix things up.
19:38If you still work in an office, next time you print out something,
19:42make sure to check out this stapler built right into the printer.
19:46It can staple all the documents that fit in the slot at the same time.
19:50By the way, it's not something new.
19:52Such printers have been around since the 90s.
19:56Why buy a ruler and spend your hard-earned dollars if you can simply use a dollar bill to measure
20:02whatever you want?
20:03Only as long as this whatever is somewhere around 6 inches.
20:08A dollar bill is just about this size.
20:12Even though many people are sure that those tiny holes on the bottom left side of your iPhone are the
20:18speaker,
20:18they're actually a microphone.
20:20And speaking of iPhones, if you've got one of the latest models and your phone is out of juice but
20:25there's no socket to be found nearby,
20:28here's a nifty trick.
20:29Grab a double-ended charger cord and connect it to another iPhone 15.
20:35Boom! Your phone gets a little power boost.
20:38I bet you've noticed that the hook on a tape measure is a little loose.
20:42Well, that's intentional.
20:43The hook moves just enough to account for its own thickness, ensuring both inside and outside measurements are accurate.
20:51So, if you ever thought it was broken, nope, it's just doing its job.
20:55As for the hole at the end, it's replacing the tape on the edge of a nail to get measurements
21:00from odd spots.
21:02The pockets on new suits are sewn shut to keep the jacket's shape during transportation and display.
21:09Of course, you can unpick them to use the pockets, but you need to be careful with what you put
21:14there.
21:14Anything heavy can easily distort the suit's shape.
21:18The important thing, though, is to remember to cut the threads holding the back vents together for better movement and
21:24comfort.
21:24Oh, and remember to cut those tacky stitches that fasten your new coat's vent, that flap on the back.
21:32Now, that sink squeegee thing actually hides a big secret.
21:36It can store water.
21:38Many sink squeegees have tiny holes that allow water to stay inside.
21:43But why would we need that water?
21:45Oh, you can release it as you squeegee, which will help you rinse the sink as you clean it.
21:52Here's a travel tip that will help you understand U.S. highways.
21:55In the U.S., highways with even numbers run east-west, and those with odd numbers run north-south.
22:02If a highway number starts with an odd digit, it's a spur, which means it doesn't reconnect to the main
22:09highway.
22:09If it starts with an even digit, it's a loop around or through a city that eventually reconnects with the
22:15main highway.
22:16And finally, numbers divisible by five are major highways meant for cross-country travel.
22:24Your iPhone camera can also translate laundry symbols, identify plants, and even recognize some bird species.
22:32It's like having a mini encyclopedia in your pocket.
22:36Another trick, when using the markup feature while editing your photos, you might want to highlight a part of a
22:43picture.
22:43Put a circle around the needed area and keep your finger pressed down at the end of the stroke.
22:49Voila! Instead of a misshapen circle, you get a perfect one.
22:52It also works for squares, triangles, and stars.
22:57Barilla, probably the most famous pasta in the world, has teamed up with Spotify to create playlists that match the
23:04cooking time for different pasta shapes.
23:07Just start the playlist when you drop the pasta into boiling water.
23:10And when the music stops, your pasta is ready.
23:15Toasters have crumb trays at the bottom that you can and should clean regularly.
23:20Just slide it out and dump the crumbs.
23:23It's an easy way to keep your toaster clean and working well.
23:27You can use Google Maps to share your location in real time.
23:31Just tap your account icon, select location sharing, and choose how long to share.
23:36Your friends can track your progress and be ready when you arrive.
23:40You can also save your parking location by clicking the blue dot.
23:45Do you know that the knobs on some ovens have calibration screws on the back?
23:49You can adjust them to get more accurate temperature control.
23:53It'll definitely help you avoid overcooking or undercooking your meals.
23:58In non-prepaid gas stations in the US, try pressing Enter before swiping your debit or credit card.
24:05It'll take you to the prepaid screen, and you can enter the amount you need manually.
24:11If you're drinking outside on a windy day, place some coins in an empty cup, and then put the cup
24:17you're drinking from inside the first one.
24:19The weight of the coins will help you keep your drink from getting blown over.
24:24Simple, but effective.
24:27Once you've peeled your potato, you might spot some tiny divots, known as eyes, that still have some skin on
24:34them.
24:34Many peelers come with a handy scoop designed to tackle these little guys.
24:38Just take the scoop, dig in, and pop them out. Easy peasy.
24:42Your favorite potato recipe will be totally eye-free in no time.
24:48A cell phone's camera can help you to figure out whether your remote is working.
24:53The camera is sensitive to infrared, so you just need to turn it on and point the remote at the
24:58camera while pressing the remote's buttons.
25:01You'll see the LED flashing in response.
25:04If you spot nothing, something is definitely wrong with the remote.
25:09Bonus fact here.
25:10White vinegar isn't just for cooking. It's also the real laundry hero.
25:15If you add it to your laundry, it'll take out all the bad smells from your clothes.
25:20The amount to add can be anywhere from a splash to a cup during the wash.
25:24And don't worry about the vinegar smell.
25:27It washes away completely, leaving your clothes fresh.
25:30It's also great for removing hard water buildup.
25:36What's hiding inside Coca-Cola cans and regular household batteries?
25:40Why do magnets affect breakfast cereals?
25:43Do crosswalk buttons actually work or are they just useless decorations?
25:49What does that USB symbol really mean?
25:52I'm not sure I know the answers to these and similar questions, but I'm eager to learn the truth together
25:59with you.
25:59Let's find it out.
26:01Coca-Cola cans have a secret few people know about.
26:05Here's a Coke can.
26:07Let's submerge it in a highly corrosive alkaline solution.
26:10The aluminum dissolves due to a process known as hydrolysis and we can see a plastic liner inside the can.
26:17It's made from a polymer or epoxy resin and serves as some kind of a protective barrier between the aluminum
26:24walls of the can and the rather acidic soda.
26:28Despite a popular myth, household batteries don't actually contain liquid.
26:33And if you accidentally cut them open, no toxic liquid will spill.
26:37Most of them are dry cell batteries which are made of electrochemical cells.
26:41Those convert chemical energy into electrical energy.
26:45Larger batteries often house numerous small cells within them too.
26:50Even Tesla vehicle batteries consist of multiple small cells.
26:53When combined, they easily provide the necessary voltage.
26:59Most toothbrushes have differently colored bristles, but they aren't just pleasing to the eye.
27:04Those bristles, often blue, have a functional purpose.
27:08They're called toothbrush indicators and their colors fade as you use the brush.
27:12The American Dental Association recommends changing your toothbrush at least four times a year.
27:18And by getting paler, these bristles help you figure out when it's time to replace your toothbrush.
27:24You'll probably agree that there's no better snack than a pack of chips.
27:28Some are flat, others have ridges.
27:30Is it just aesthetics?
27:32Not really.
27:34The main purpose of those lines on some kinds of chips is to help with the distribution of spices and
27:39seasonings.
27:39In other words, all those substances that make your chips taste like cheese are mostly stored inside the lines.
27:46Plus, the lines make chips crunchier.
27:50Now this one might be a surprise, but some breakfast cereals are magnetic.
27:54That's because they're often fortified with iron in the form of a fine powder.
27:59Due to the added iron, cereal flakes get attracted to magnets.
28:03All this may sound kinda alarming, but in reality, the iron content in the flakes is minimal and doesn't pose
28:09any threat to your health.
28:12That clear fluid in gel pens is called the ink follower or stopper fluid.
28:17The gel in such pens contains pigment particles dissolved in a polymer solution.
28:22The main task of the stopper fluid is to be a barrier to prevent the gel from evaporating or leaking
28:27out.
28:28Without this transparent fluid, your gel pen wouldn't function.
28:33The fluid always stays in one position and doesn't get dissolved with the gel.
28:37Neither does it move backwards or flow out of the pen.
28:42Many pedestrian crosswalk buttons, namely in New York, are placebo buttons.
28:47They do literally nothing when you press them.
28:50Originally, they were functional after being introduced in 1964, but today, most of them don't affect traffic lights,
28:57which are programmed based on the real needs of the traffic flow.
29:01Why do such buttons even exist then?
29:03It's a simple psychological trick, providing you with an illusion of control.
29:09You might have noticed that movie theater seats are almost always red.
29:14This choice isn't random.
29:16It has strategic importance, which is rooted in visual science.
29:20The thing is, red light has a longer wavelength.
29:23It means that it's the first color to disappear in low light.
29:26It allows the audience to concentrate better on the screen once the movie begins.
29:30Such a design choice enhances the viewing experience by minimizing distractions.
29:36Speed bumps are crucial for pedestrian safety.
29:39But at the same time, they can seriously increase car emissions due to the non-stop acceleration and deceleration they
29:46cause.
29:48To address this issue, some cities like London are testing fake speed bumps.
29:52Those are optical illusions painted on the road.
29:55They look raised from a driver's perspective, but in reality, they're flat.
30:00Authorities hope that this approach will slow down drivers without having a negative impact on the environment.
30:08Soda bottles are always filled in such a way that there's some space between the liquid and the cap.
30:13That's because soda contains carbon dioxide.
30:16It's a gas that can expand once the bottle's heated.
30:19If there's no gap in the bottle, it can break because of the pressure building inside.
30:25Also, when you open your drink, the gases go out in the form of bubbles, making the drink overflow.
30:31The gap helps with this problem, too.
30:35The USB symbol, looking like a trident, has always sparked multiple speculations about its origin.
30:42One popular idea is that it represents Neptune's trident and symbolizes power and adaptability.
30:48But there's also a little bit less exciting theory.
30:52A man who claimed to have designed the symbol in the 1980s stated that it was supposed to represent connectivity.
30:58The large circle symbolizes a computer, while the attached shapes – the circle, the triangle, and square – stand for
31:05different outputs.
31:08The design of a tennis racket has a specific feature known as the throat.
31:13It's an open space below the head of the racket.
31:16This space isn't just for storing balls, it also improves the racket's aerodynamics by letting air pass through.
31:23It seriously reduces drag during swings.
31:27Speaking of tennis, tennis courts are usually built with a north-south orientation.
31:33It helps minimize the impact of the sun's position during the game, ensuring that neither player has the sun directly
31:39in their eyes.
31:41Look closely at a tram's overhead lines, and you'll see that its contact wires zigzag back and forth instead of
31:48going in a straight line.
31:50That's because all trams have pantographs attached to their roofs.
31:54The upper part of the pantograph is gradually worn down by the overhead wire and eventually needs to be replaced.
32:01To wear it down evenly, the wire is not installed strictly along the tram's path, but in zigzag patterns.
32:09As the tram moves, the pantograph slides along the wire, and it wears down evenly.
32:16Those cone-shaped water cooler cups?
32:19Their shape is intentionally designed to prevent users from setting the cups down.
32:23This allows employees to minimize the risk of spilling water on their desks around various electronic devices.
32:30Plus, less material is used to produce cone-shaped cups, which makes the process less wasteful and more cost-effective.
32:37It also kind of supports sustainability by encouraging people to drink their water quickly and dispose of their cups immediately
32:44after.
32:47Most suitcases have two zipper pulls, and it serves several purposes.
32:52First of all, if one zipper fails, the other can keep the suitcase closed.
32:57Even better, having two zippers allows you to have easier access to small sections of your suitcase without having to
33:04open it entirely.
33:06And finally, when you have two zippers, you can connect them with a padlock for increased security.
33:14Some plastic milk containers have dents on their sides.
33:17These dents serve several purposes.
33:20When milk spoils, it usually causes swelling and high-pressure buildup inside the container.
33:25That's when the dent pops out and doesn't let the jug blow up.
33:29Plus, if you decide to freeze the milk, it will expand like any other fluid.
33:34And then again, the indentation will pop out and prevent the container from breaking inside your freezer.
33:42If you ever had a problem figuring out why fake pockets exist, you need to hear this.
33:48The main reason is that if a clothing item has a specific cut or shape, pockets may spoil it.
33:54They can alter the item's shape either in the warehouse or already on the retail rack.
33:59The solution? Getting rid of the pockets in key areas.
34:03Plus, fake pockets are obviously cheaper, and they don't get stretched out.
34:09The thermos wasn't actually invented to keep your coffee warm.
34:14It was made by a Scottish scientist who wanted a safe place to keep his chemicals at a stable temperature.
34:20So, he took two bottles, put the smaller one inside the bigger bottle, and vacuumed out the air between them.
34:27Let's go.
34:27Let's go.
34:28Let's go.
34:29Let's go.
34:30Let's go.
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