- 1 week ago
Discover the intriguing world behind the code 4q in this captivating video. We explore its secrets and what it could mean, offering a fresh perspective on this mysterious element. Perfect for curious minds eager to uncover hidden messages and unlock new insights.
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00:00I have a collection of questions you've always wanted the answers to. Let's go!
00:07First, an observation. Cookies and baguettes are basically kinds of bread.
00:12So my question is, why when left outside for the night, a cookie gets soft and a baguette becomes hard?
00:20It doesn't make any sense.
00:23Well, the thing is, cookies are sugary bread.
00:26The sugar and salt in them soak up the moisture from the atmosphere, so they get soft.
00:33Baguettes don't have much salt and sugar, so they don't attract water and just dry out.
00:41Superglue sticks everything to everything, but how come it doesn't get stuck to the tube?
00:46Turns out that the glue needs some compound with hydrogen to polymerize.
00:52In the tube, there's just oxygen and no water, but outside, there's plenty of moisture.
00:59Also, this explains why the stuff always sticks so well to your fingers.
01:04They're warm and perfectly moist.
01:08I'm sure you cried at least once when cutting an onion.
01:11Why does it happen?
01:13So onions and garlic contain amino acids, and one of the compounds gets decomposed when being sliced.
01:21It turns into an irritator when it comes in contact with water, in particular, your eyes.
01:27Your eyes release tears to wash the irritant away, so that's why you cry.
01:33There are a couple of tricks that can prevent it.
01:35When cutting an onion, try keeping a sugar cube between your teeth.
01:39It'll absorb the irritant.
01:40Another life hack is to hold a small piece of bread between your lips.
01:44It can help you too.
01:48Why do you see things when rubbing your eyes?
01:51These colors and shapes are called phosphenes.
01:53The reason why you see them is that when rubbing, you increase the pressure in your eyeballs and activate the
02:00neurons of the retina that process visual information.
02:03Once they're activated, your brain interprets it as seeing something.
02:09When you don't get enough sleep or are just too tired, you get those dark circles around your eyes.
02:15Want to know why?
02:16The skin under the eyes is very thin, so blood vessels are very close to the surface there, and you
02:22can see any difference easily.
02:24If you have a lack of sleep, your skin gets paler, and the blood vessels are even more visible.
02:31So you can see those dark circles showing through the skin.
02:34Also, with age, the skin naturally gets thinner, so that's why older people tend to have dark circles.
02:41But if you're young, just try to get more sleep.
02:46Let's pay a bit of attention to backpacks.
02:49They have a few interesting features.
02:51First, some of them have sternum straps, and they are quite helpful.
02:55They allow you to redistribute the weight of the backpack a bit, lifting some of it from your shoulders.
03:01Not much, but just enough to make your backpack lighter and easier to carry.
03:07And, of course, the sternum straps prevent the shoulder straps from sliding off.
03:13Okay, the next thing is gear loops.
03:15And probably from the name of it, you already have an idea of what you need them for.
03:20You can strap in some useful gear you need with you, like trekking poles or shovels.
03:26Some gear will need to be secured to do it.
03:29Drop the handle through the loop and rotate it upward.
03:32Then, secure it with the elastic hook at the top, and you're golden.
03:37And yes, all backpacks have loops.
03:40Actually, I never thought of their purpose until today.
03:43Some people say that if you slide your thumbs through them,
03:46it makes the backpack sit tighter on your back, making it more comfortable.
03:51Other people just rest their hands there.
03:53But the reason why they're there is probably to prevent the ends from sliding back from the buckles.
03:59That would be quite a headache to slide them back all the time, right?
04:05Okay, let's look into some other ordinary stuff we've never paid attention to.
04:10Let's take, for example, jeans.
04:12They have those metal rivets.
04:15It turns out that they've been there as long as jeans exist.
04:19Jacob Davis, the man who made the first pair of jeans,
04:22added copper rivets to places where the pants were more likely to rip to make them stronger.
04:28So, it was a crucial detail to keep jeans together.
04:31Today, they have a more decorative purpose because they're distinctive and traditional for jeans.
04:39Also, many zippers have the letters YKK engraved on them.
04:44Those are the initial letters of Yoshida Kogyo Kabushiki Gaisha.
04:49It's the name of a Japanese company that can be translated as Yoshida Manufacturing Shareholding Company.
04:55It's the largest zipper manufacturer in the world,
04:59so all zippers produced by them are marked with these letters.
05:03It's estimated that the company produces half of all zippers in the world.
05:09That's why you see their zippers more often than any others.
05:15Have you noticed that canned and bottled soda seems to taste different?
05:19You're not wrong.
05:21That's actually true.
05:22And there's even science behind it.
05:25Chemists say that aluminum cans have a polymer layer that absorbs some of the soda's taste.
05:30So cans indeed change the taste.
05:33Chemicals in a plastic bottle can add some acetyl-dehyde,
05:37a by-product that gets formed while plastic is melted, to the drink.
05:41So, they also change the taste a bit.
05:44You never really drink the original drink.
05:47If you want to try the real thing, buy sodas in glass bottles.
05:51When soda is stored this way, its taste is the most similar to the original one.
05:59Plastic bottles with soft drinks have five bumps on the bottom,
06:02and water and juice plastic bottles have almost flat bottoms, except for a little kink.
06:08It's not random.
06:09A plastic bottle is made by putting a plastic tube into a mold
06:13and blowing some air inside to make it expand until it takes the needed shape.
06:19The problem is that at the bottom,
06:21the bottle will always have an outward kink that will make the bottle unstable.
06:27To avoid it, some air is also pushed inward from the bottom,
06:32creating that small punt at the base of it.
06:35Flat bottle bottoms are common because they need less plastic to be made,
06:39but soft drinks and sparkling water need special treatment.
06:43These liquids have internal pressure that can push the plastic outward,
06:48messing up with the punt and the stable form of a bottle.
06:52So, soda bottles have a curved shape
06:55because this way they're more pressure resistant.
06:59Compare folding a regular piece of paper to folding a paper too.
07:04The latter will have more resistance.
07:06In the same way, curved plastic is more resistant to any pressure.
07:12Take a closer look at your bag of chips.
07:15You can probably find these little colored circles.
07:18They're made by the manufacturer to test the print that is used on the package.
07:23They're called color control patches.
07:26The circles are not the same palette as the final package.
07:30They're layered on top of each other to achieve the final color of the bag.
07:35So, why do manufacturers need them again?
07:38Imagine that something is off and the printing machine prints a bunch of wrong packages.
07:43That's a lot of wasted money.
07:46So, these control patches are there to make sure that the final print is going to be correct.
07:51If they're off, the manufacturer will know that the whole package is going to be off too.
07:58These patches allow the printers to find a surplus or a deficiency of color and solve the issue.
08:04But don't worry if you don't find these circles.
08:07They probably just got cut off.
08:11Take a good look at a milk jug.
08:13There's often an inverted circle on one of the sides.
08:16This dimple is there to make the jug more resistant and to prevent it from rupturing if the jug falls
08:23on the floor.
08:24The dimple gives some more space for the liquid to expand.
08:29Also, as the expiration date approaches, the microbes in the milk start to expel some gases.
08:35As more and more of them get trapped inside, the pressure in the jug rises.
08:40The dimple accommodates the expansion and prevents the jug from bursting.
08:49You see these blades?
08:50They have notched corners to make your cutting experience smoother.
08:54Ooh!
08:55The front edge notch helps with separating blades during manufacturing.
08:59While the trailing edge notch helps the blade glide easily.
09:03And a fun fact!
09:05That notch on the front also helps you spot unused sections of the blade.
09:09Just a little visual indicator to make your life easier.
09:12When it comes to silver vs. black blades, they're both made from the same stuff.
09:17But black blades are sharper and are better suited for cutting through tough materials.
09:22While silver blades strike a balance between cutting power and durability.
09:27If you want that extra cutting oomph, go for black.
09:30Oh, almost forgot!
09:32The only thing those blades aren't meant to cut is food.
09:35It has a rust-proofing oil coating, which is not safe for humans.
09:41Check this one out!
09:42It's totally giving me childhood vibes.
09:45Now, I remember my grandma having tomato-shaped pin cushions just like this.
09:49And sometimes they would look more like a salad, with a little pepper thrown in there.
09:54Well, believe it or not, this salad actually has a purpose.
09:58The tomato keeps your pins in place, while the pepper keeps them sharp.
10:03Those peppers are filled with sand, which helps keep your pins nice and sharp.
10:07And it's not just sand.
10:09Crushed walnuts can also be used to keep your pins in tip-top shape.
10:14Now, look at this multiple pocket tool and this little hook on it.
10:18It's a bit of a mystery, but it's actually pretty handy.
10:22I counted at least four different applications.
10:25One, you can use it to carry all sorts of awkward stuff, like camping gear or heavy parcels.
10:31Two, need to twist some wire or play around with knots?
10:34The parcel hook has got you covered.
10:37Three, this hook can save the day with those stubborn zippers, like the ones on your luggage.
10:43Four, it's great for pretending to be a budget version of Captain Hook.
10:47If you know more applications, let me know in the comments.
10:52Apple users, with this feature, you'll never get laundry surprises again.
10:56Now, I bet you've had this situation at least once in your life.
11:00You wash your stuff, and when you take it out of the washing machine, the size seems to only fit
11:06your cat.
11:07Your iPhone camera can actually translate those funky laundry symbols for you.
11:11There are two requirements, though.
11:13You must have iOS 17, and your phone must be in English.
11:17Take a photo of the care label, go to the Photos app, and see the details of the image.
11:22Everything will be automatically decoded and explained to you.
11:28Now, many toasters come with nifty, removable crumb trays at the bottom.
11:32It's super important to give these trays a good clean every now and then to keep your toaster running smoothly
11:38and avoid any potential fire hazards.
11:41Just pop them out, shake out the crumbs, and you're good to go.
11:44Where you shake them out is up to you.
11:47Those little compartments on your gas pump aren't just for show.
11:50They're actually there to hold your cap while you're filling up.
11:53This nifty feature keeps things tidy and prevents any spills or drips on the handle.
11:59So, say goodbye to messy refueling experiences and hello to a cleaner pump.
12:04Plus, it makes the whole process way more convenient and efficient.
12:10Now, I'll bet your oven gets so greasy and dirty sometimes that you can even hear it oink.
12:16Just kidding.
12:17I know you're a tidy person.
12:19Anyway, if you're looking for a way to bring your kitchen cleaning to a whole new level, here's a tip
12:24for you.
12:25Most oven doors have handy latches that let you pop the door off for easy cleaning, saving your poor back
12:32from the strain.
12:34When you're draining noodles or potatoes, there's no need to bother transferring everything to a colander in the sink.
12:40Just throw the colander right into the pot, hold it down, and pour the liquid out.
12:46It makes life so much easier, especially when you want to save that starchy water for recipes.
12:51It's a must for authentic pasta, by the way.
12:56So, let's say you've snagged this gem at a thrift store a while back for just under a dollar.
13:01It's seen better days, serving as an ashtray, but you decide it's time to give it a new lease on
13:07life.
13:08Here's the lowdown on how to make it shine again.
13:11Mix up a solution of boiling water, baking soda, and table salt in a bowl lined with aluminum foil.
13:18Let the piece soak for about 15 minutes, and repeat this process three times.
13:24In between soaks, gently scrub any rough spots with a microfiber cloth.
13:29After the final soak, dry the piece off and rub on some toothpaste, baking soda, and peroxide.
13:35Buff out any remaining tarnish with a clean, dry microfiber cloth.
13:40Rinse it off, and now your piece is practically gleaming like a mirror.
13:46These aluminum foil boxes have nifty little tabs on the sides that make it super easy to grab a sheet
13:52without any hassle.
13:53It's like a fancy little bonus that makes the product a breeze and ensures you'll have a smooth sailing experience
14:00every time.
14:03Manual can openers often come with a handy built-in feature, also known as a bottle opener.
14:08It's like getting two tools in one.
14:10But did you know that this bottle opener actually has another useful function?
14:15It can help you loosen those stubborn, hard-to-open jars.
14:19Simply lift the lid slightly at a couple of points with the bottle opener, and then watch it as it
14:25effortlessly twists right off.
14:27Yeah!
14:30Okay, I just found that, apparently, you're supposed to save the first and last slices of a loaf of sliced
14:36bread for last.
14:37It's like a bread hack or something.
14:40Apparently, those end pieces help keep the rest of the bread fresher for longer, and you shouldn't eat them until
14:45you've devoured the rest of the loaf.
14:47So, next time you're making a sandwich, save those heel slices for the very end.
14:52Even bread-eating needs a good strategy.
14:55Now, look at those blue levers on the top rack of your dishwasher.
14:59I was curious about them, too.
15:01And it turns out they are actually water bottle sprayers.
15:04They help to ensure that your bottles get a thorough cleaning and rinse during the wash cycle.
15:11Many vegetable peelers have those little scoops on top for taking out the eyes from potatoes.
15:16And here's a cool tip.
15:18You can actually use vegetable peelers in both directions to peel faster.
15:23But most people just stick to one direction.
15:27When using yellow mustard, make sure to push the lid of the bottle all the way open until you hear
15:32a satisfying click.
15:34This way, the lid will stay securely in place and won't get in the way when you're dispensing the mustard
15:39onto your food.
15:40It's a simple step that can make your condiment experience hassle-free and enjoyable.
15:46So there!
15:48You know that little hole at the end of your pot or pan?
15:51Well, it's not just for show.
15:53You can actually use it as a handy holder for your forks and spoons.
15:57Next time you're cooking up a storm in the kitchen,
16:00just pop your utensils in that convenient little hole and keep them close at hand.
16:06Okay, just a heads-up to remember to switch the direction of your ceiling fan for the changing weather.
16:12And to give it a good clean, too.
16:14I've seen that a lot of folks found it helpful before to reverse the fan's direction by flipping a switch
16:21for different seasons.
16:22So this is just a friendly reminder to go ahead and do it again,
16:26pushing hot air down and pulling cold air up.
16:31When you're chowing down for some pizza, just tear off the top of the box and use it as a
16:37big old plate.
16:38You can even rip the box in half and fold it to save some leftovers for later.
16:42Well, that's it for today.
16:44What, you want to know more cool facts?
16:47Sure, but you'll have to subscribe and hit the bell to get more videos.
16:51I'm waiting. Go ahead.
16:56So, you wake up and see that an out-of-control fire has taken over your room.
17:01At this point, the biggest danger isn't even the flames, it's the smoke.
17:06In the United States, smoke inhalation accounts for 80% of the fatalities caused by fires.
17:12That's why it's always a clever idea to have this mask close by.
17:16This is a personal escape hood, equipped with its own breathing filter,
17:20allowing people to escape intense situations like this.
17:23It only takes around 10 seconds to put this on, and it provides breathable air for 20 minutes.
17:29And those 20 minutes can make all the difference when it comes to surviving.
17:33But if your apartment is at the top of a burning building,
17:37going out the window might be your only way out.
17:40But hold on.
17:41First, you need to wear a backpack like this.
17:44This is actually a parachute safety system, known as SPARS.
17:48What it does is inflate a device with a parachute in about 15 seconds.
17:53The device, developed with advanced aerospace technology,
17:57will slow down your fall and make sure you land safely and as quickly as possible.
18:02If using a parachute feels a little too extreme to escape a fire,
18:06there is another option.
18:08The Rescue Ready Retrofit Ladder.
18:10This device is made from lightweight, durable materials
18:14and offers a safe way out in situations like a fire on the second floor of a house, for example.
18:20The latter can easily be installed right under windows,
18:23making it easy to use when you need it.
18:26One thing about fires is that they usually start small.
18:29So the key is to isolate and put them out before they turn into a big problem.
18:35That's why some smart people teamed up with firefighters to create the Bridge Hill Fire Blankets.
18:40Think of it as a futuristic fabric with cutting-edge technology
18:44that can contain flames, smoke, and toxic fumes in just a few seconds.
18:51Okay, blame it on the classic movie Jaws.
18:53But let's face it, sharks have been living rent-free in our heads ever since.
18:58And while shark attacks aren't very common, they still happen.
19:02In 2023, there were over a hundred reported incidents worldwide.
19:07But you don't have to live in fear, thanks to items like shark bangs.
19:12This is a wearable device that can ward off sharks, and it doesn't need batteries or charging.
19:17You just wrap it around your ankle and let its powerful magnets do the work.
19:21What happens is that when a shark gets close to someone wearing the device,
19:25it senses the strong magnetic field coming from it.
19:29Then the shark probably freaks out because the signal is way stronger than any of its normal prey.
19:35So it ends up swimming away from you, or at least, that's what we hope for.
19:40Now, sharks aren't the only danger you face in the water.
19:43All it takes is a sudden change in the tide,
19:46and you could find yourself in a situation where you need to fight to avoid drowning.
19:51But if life jackets feel bulky and uncomfortable to you, there is another option, the king jean.
19:57This is considered the smallest inflatable lifesaver in the world.
20:01It kind of looks like a high-tech bracelet.
20:04But when activated, it turns into a buoy in seconds.
20:07What's even more impressive is that you can reuse it up to 50 times,
20:11if you're that unlucky or careless.
20:14All you have to do is repack the balloon and swap out the CO2 cartridge before your next sea adventure.
20:20It also comes with a whistle, so you can get the attention of rescuers in case of an emergency.
20:26Now, this may look like a simple, ordinary credit card, but it can actually save you.
20:32Imagine you're in a car accident, and the vehicle ends up in a lake.
20:36As the car sinks, you're trapped, unable to open the window.
20:40Terrifying, right?
20:41Well, that's exactly why the OWL escape card exists.
20:45OWL stands for Open Window for Life, and just like the name suggests,
20:50it was designed to shatter your car's window in any emergency.
20:54The driver just needs to insert the card into the top or side slot of the window,
20:59with the arrow facing up.
21:01Then pull the base of the card toward them and release it.
21:04Bam!
21:05The glass shatters outward.
21:07But that's not all.
21:08It also has a built-in safety cutter to help you slice through a stuck seat belt.
21:13You've probably heard a million times how wearing a helmet while biking can save your life.
21:19Still, a lot of people skip it, saying they don't want to carry a bulky thing around all day.
21:25Well, those days are over with the foldable helmet.
21:29Thanks to its cool, adaptable design, it goes from a spherical shape to something more flat.
21:34So, once you're done with biking, just fold it up and throw it in your backpack.
21:39It's that easy.
21:41Outdoor adventurers will love the LifeStraw Sip.
21:44This stainless steel straw promises to clean in pure water using a filter that blocks 99% of bacteria, parasites,
21:52and microplastics.
21:54In other words, this tech can definitely prevent you from having any serious health issues.
21:59Its design is super slim and lightweight.
22:02Plus, there's no need for charging or batteries, so it's the perfect travel companion if you're planning a little getaway
22:09to the middle of nowhere.
22:12So, skiing can be pretty dangerous.
22:14But even so, millions of people are willing to take that risk every year.
22:19One of the big problems with heading out into the snow is that avalanches aren't always easy to spot.
22:25It's believed that for every four fatalities from being buried in snow, three are caused by asphyxiation.
22:33So, bringing the safe back SBX survival gear on your next trip is definitely a smart move.
22:40This is the world's first active air supply for snow burial, designed to keep avalanche victims breathing under the snow
22:47without a mouthpiece.
22:48What it does is create airflow through the snow, by pushing away the CO2 that's been exhaled.
22:55This increases the survival window to over 90 minutes, which can be enough time for rescue teams to find the
23:02victim.
23:03Now, you never know when you might find yourself in a dangerous situation out of the blue.
23:08Even when you're just relaxing at home, something unexpected could happen, like a stranger breaking in.
23:14In situations like that, you probably need to stay quiet so you don't draw attention to yourself, and calling 911
23:22could be too risky.
23:24That's where safety apps like Noonlight come in.
23:27If you ever feel unsafe, just open the app and press the panic button right in the center of the
23:33screen.
23:34If everything's okay, release the button and enter your four-digit PIN.
23:38But if things take a turn and you're in real danger, release the button without entering the PIN.
23:44The app will automatically notify the police and share your exact location so they can send help.
23:52Yep, the next product on our list is a toilet seat.
23:56But it's not just any regular one.
23:59This is the first-of-its-kind smart toilet seat that can actually tell if your body's at risk.
24:05How, you ask?
24:07Well, it monitors your number one and number two with some pretty advanced sensors.
24:12Then it gives you insights to help track and improve your gut health.
24:16And maybe even prevent serious problems down the line.
24:20Right now, this tech is especially useful in senior living facilities.
24:24The last item on our list isn't something you'd need at home.
24:27But if you ever see one next to you, just grab it.
24:31This colorful thing is called the Dazzle Box, and it could save a lot more disaster victims,
24:37especially during earthquakes and floods.
24:39It's a super-tough container designed to drop supplies from a plane or a helicopter.
24:45What's impressive is that the materials used for the Dazzle Box survived a 150-foot drop from a crane
24:51and it stayed intact.
24:53The inventors even added emergency LED lights, so it's visible at night.
24:58Right now, this funny-shaped box is still a prototype that won a design contest.
25:03But if it ever hits the market, it could really become a game-changer.
25:09You must have noticed those lines on some kinds of chips.
25:12For one thing, they help with the distribution of spices and seasonings.
25:16In other words, all those substances that make your chips taste like cheese
25:21are mostly stored inside the lines.
25:23Plus, the lines make chips crunchier.
25:29Some cars have a tiny coffee cup sign on their dashboard.
25:33It's the vehicle's anti-drowsiness mechanism.
25:36There are manufacturers that equip their cars with a drowsiness detection system.
25:42It analyzes the speed, wheel angle, and lane deviations to figure out if it's time for the driver to take
25:48a break.
25:49If it is, the vehicle makes several audio signals and the coffee cup sign starts to flash.
25:57Some plastic milk containers have dents on their sides.
26:01These dents serve several purposes.
26:05For one thing, when milk spoils, this process usually causes swelling and high-pressure buildup inside the container.
26:12That's when the dent comes in handy.
26:14It pops out and doesn't let the jug blow up.
26:18Plus, if you decide to freeze the milk, it will expand like any other liquid.
26:24And then again, the indentation will pop out and prevent the container from breaking inside your freezer.
26:31You might have wondered why jerry cans have three handles.
26:35It's a clever designer move.
26:38This way, if you carry the container alone, you can use only the central handle to distribute the weight evenly.
26:46But, if your friend wants to help you out, each of you can grab the side handle.
26:51The first jeans had a problem.
26:54Workers and miners, who were the original jeans wearers, put too much pressure on the poor piece of clothing.
27:00As a result, the seams couldn't withstand the stress and tore.
27:06Tiny metal studs were invented to prevent this from happening.
27:11Sticky notes come off relatively easily, because their adhesive is spread out across the paper unevenly, in small blobs.
27:19And only some of these blobs touch the surface of whatever you've stuck the note on.
27:24That's why when you unstick a post-it and attach it to something else, it still works, until all the
27:30glue gets used or covered with dirt.
27:34Soda bottles are always filled in such a way that there's some space between the liquid and the cap.
27:41That's because soda contains carbon dioxide.
27:44It's a gas that can expand once a bottle is heated.
27:48If there's no gap in the bottle, it can break because of the pressure building inside.
27:54Also, when you open your drink, the gases go out in the form of bubbles, and the drink is likely
28:00to overflow.
28:01The gap helps with this problem, too.
28:05Dental floss is super useful for your teeth, but it might be rather hard to operate.
28:10It regularly slips out of your fingers and tangles.
28:14To avoid these problems, tear off a piece of dental floss and tie its two ends together.
28:21It'll be much easier to use and won't hurt your fingers.
28:26Now, about those horizontal lines on plastic bottles.
28:30They help hold bottles up.
28:32Some bottles are produced from soft plastic.
28:36Without the lines, they wouldn't keep their shape.
28:39Instead, they would twist easily or even break.
28:44The soft, round part under a soda bottle cap keeps the carbonation from escaping.
28:50Without it, your pop would go flat in no time, probably even before you buy it.
28:57If you don't have anywhere to put a toothpick after using it,
29:01break off its flat end at the first groove and place it on the table.
29:05Now, you can balance the used portion of your toothpick on the grooved part
29:10so that it doesn't have to touch the table.
29:13You can also make a makeshift stand for disposable chopsticks.
29:18They have a sort of lump on one side.
29:21Break that lump off before you split the pair.
29:24Now, when you want to take a sushi break,
29:27just place the stick on this stand.
29:32Donuts are shaped like rings because, otherwise,
29:35they might get overdone at the edges, but uncooked and gooey inside.
29:40With a hole in the center,
29:42both the outside and the inside get ready at the same time.
29:47Ever notice that layer of clear fluid in gel pens?
29:51It's called the ink follower, or stopper fluid.
29:55The gel in such pens contains pigment particles dissolved in a polymer solution.
30:02The gel should be thick enough to keep the pigment particles suspended,
30:05but also thin enough to flow first onto the ball and then the paper.
30:11The main task of the stopper fluid is to be a barrier
30:14to prevent the gel from evaporating or leaking out.
30:18Without this transparent fluid, your gel pen wouldn't function.
30:22The fluid always stays in one position and doesn't get dissolved with the gel.
30:27Neither does it move backward or flow out of the pen.
30:32Some button-down shirts have a button hidden on the back of the collar.
30:37It's main purpose is to prevent the tie from sticking out from under the collar.
30:43As for that locker loop on the back,
30:46you can use it to hang the shirt on a hook to avoid wrinkling it.
30:52Outer rings and zipper sliders,
30:54especially when two sliders are used together,
30:57are added so that you can connect them with a lock
30:59and keep sticky fingers away.
31:03Most ambulance cars have this word.
31:06Printed on the front of the vehicle,
31:08that's the word ambulance backward.
31:11It's written in reverse so that the driver in front of the ambulance
31:15can see the word properly in their rear-view mirror.
31:19Then they can move out of the way and let the ambulance pass.
31:24Escalator brushes serve an important safety purpose.
31:28You might have heard that most accidents happen
31:30after people get their bags or clothes stuck in escalators
31:33because they stand too close to the sides.
31:36But when there are nylon brushes on both sides,
31:40you can't but keep your feet away from the escalator's skirt panels.
31:43The result?
31:44No accidents.
31:46The side holes in sneakers are for laces.
31:51Since sneakers were originally invented for basketball players,
31:55this interesting design allowed them to accommodate any player's foot.
31:59They just needed to lace their sneakers in the most comfortable way for them.
32:05The holes in the bottoms of your earphones allow air to circulate up and through the speakers.
32:11It helps to increase low frequencies, making the bass sound deeper.
32:15The quality of the sound also becomes much better.
32:20Ever been stranded with a cup of applesauce but no spoon at hand?
32:25But each snack pack already has a built-in spoon.
32:29Several twists of the foil lid and here you go.
32:35Diamond slits on backpacks were originally placed only on traveler bags.
32:40Their purpose was to carry ropes.
32:43These days, you can find such slits on almost every backpack.
32:48Why not use them to carry a bottle of water, an umbrella, or a pair of sneakers?
32:54Highlighters are filled with a special semi-transparent fluorescent ink
32:58that can glow in dim light.
33:01Yellow and light green hues are the most popular
33:04because they don't prevent you from seeing the text after black and white photocopying.
33:10Photocopiers perceive yellow and light green marks
33:13as almost non-existent and don't print them.
33:18A stop sign has an octagonal shape to help drivers recognize it easily,
33:22even if they see it from the back.
33:25When the signs weren't reflective yet,
33:27this shape prevented drivers from confusing the stop sign with any other night.
33:33The number 57 on a Heinz ketchup bottle has nothing to do with the product label.
33:39The truth is that the place with the numbers
33:42is the very sweet spot you should tap to get the ketchup flowing.
33:46So, stop hitting the bottom of your sauce bottle and hit 57.
33:52Lots of private houses have triangular-shaped roofs
33:56because this allows rain, snow, and fallen leaves to slide off the slope.
34:01If all this stuff piled up on top of your house,
34:05one day, your roof would collapse.
34:09Airplane windows have rounded edges,
34:11and that's a crucial safety measure.
34:13It prevents aircraft accidents.
34:16Weak spots are usually situated in the corners.
34:20If airplane windows were square or rectangular,
34:23each of them would have four potential weak spots.
34:26Under pressure, they would collapse.
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