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