- 1 hour ago
Discover the real purpose of 20+ everyday things your dad probably never had to Google. Learn the hidden functions behind common objects, old-school features, and clever design details most people overlook. Find out what previous generations seemed to know automatically. Some will spark nostalgia, others will feel like life hacks you should’ve learned years ago.
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FunTranscript
00:00So, grocery carts have loops for a reason.
00:03You don't want to put your jacket in your cart next to a bunch of potatoes and onions, do you?
00:08Hang it on the loop instead.
00:10It's there to help you organize your cart better.
00:13Carts also have a cool section at the bottom.
00:16Whenever your cart's full, just lift it up and attach a shopping basket for extra purchases.
00:21Lift up the whole metal thing,
00:23sit your basket on the horizontal bar above the wheels,
00:27and secure it with those handy hooks.
00:30If you've got some pesky parsley stuck in your teeth, try this tip.
00:34It can be hard to get it all out with loose floss.
00:37You need more tension.
00:38Just tie it in a knot.
00:41Toothpaste stripes may seem a bit weird.
00:43It's just a marketing trick.
00:45Back in the 70s, a leading toothpaste brand added a blue stripe
00:50to show that their toothpaste had double action.
00:53Solid white toothpaste worked just as well.
00:55But those blue bristles on your toothbrush actually make sense.
01:01They gradually lose their color over time.
01:04When the blue's faded, it's time to change your toothbrush.
01:08Ever notice that tiny hole on the bottom of a padlock?
01:12Its hidden purpose is to drain water out to keep it from rusting.
01:16It's also the place to lubricate a padlock.
01:19A drop of oil in there will make it open and close way easier.
01:23Those ridges on the edge of dimes aren't just for show.
01:27People used to shave off the edges, then melt the edges down into new coins.
01:32But thanks to the new design, it's easy to tell if someone's been shaving the edges off.
01:38If you still struggle with peeling an orange, here's another way of opening it.
01:43First, cut off the top and bottom.
01:46Make a slit on the side and pull it open.
01:49That knobbly bit sticking out of the cap of your favorite cream is there for a reason.
01:54These tubes are usually sealed with foil.
01:57So, unless you love breaking your nails trying to open them,
02:00just flip the cap over and push.
02:03The tiny rubber disc under every bottle cap isn't just for seeing if you want a lifetime supply of soda.
02:11It's what keeps your drink all nice and bubbly.
02:13The lid keeps the liquid inside.
02:16The rubber disc keeps the gas inside.
02:19Until you drink it.
02:21If you use the blue side of your eraser to erase pen,
02:25your notebooks are probably all full of holes.
02:28The blue side's there for when you need to erase something on much thicker paper.
02:32It works on pencil and even ink, as long as the paper's thick enough.
02:37Your bobby pins might not stay in place if the grooves aren't facing the right way.
02:42They should always be on the bottom, close to your head.
02:46Still coming loose?
02:47Put a squeeze of hairspray right onto the bobby pin before you put it in your hair.
02:53Many glass bottles usually have some sort of indent at the bottom.
02:58It's handy if you want to be fancy.
03:00Put your thumb in the indent and pour away.
03:04The technical name for this little dude is a punt.
03:07Those sugar sticks at your local coffee stand are ready to be opened in a new and easier way.
03:14Look how happy they are!
03:15Try splitting it right down the middle.
03:18No more sugar on your fingers.
03:20No more tiny little paper bit.
03:22Even your coffee's happier.
03:23Your cotton rounds pack has those strings on it, so you can hang it on a handy hook in the
03:29bathroom.
03:30But there's no need to loosen and tighten back up again every time.
03:35Check out the bottom of the pack.
03:37It has a perforated line.
03:39Tear it open carefully, and you're good to go.
03:43Doorknobs are usually made of brass, bronze, or some other copper alloy.
03:47Why?
03:48They're antibacterial, so they stop microbes from spreading.
03:52Just a couple of hours, and the pesky microbes are gone.
03:56But don't forget to wash your hands anyway!
03:59Bottles have long necks for a reason.
04:02Hold the neck, not the bottle, if you want to enjoy a cold drink.
04:07Two zips too much?
04:08Maybe.
04:09But they come in handy as a clever anti-theft device.
04:13Just lock them together.
04:14Now, no one can open your backpack.
04:17Don't have a lock on you?
04:19You can also tie them together with some string, or even just a paper clip.
04:23Anything to slow those pickpockets down.
04:27That tiny little button on the back of a shirt collar is used to hold your tie in place.
04:32You don't want your tie trying to escape back there.
04:36Shoe manufacturers care about their customers.
04:38So, most running shoes now have a special anti-blister system, pre-installed.
04:45Hmm.
04:45Sounds intense, but it's basically just that extra hole on top of your sneakers.
04:50Make a loop with the extra hole, inserting the lace backwards.
04:55Cross your laces and put them through the loops.
04:57Now, pull the laces down to lock your foot in place.
05:02Now, run!
05:04You'll find silica gel packets when you buy bags, shoes, even some snacks.
05:09Don't throw them away.
05:11They soak up excess moisture.
05:13So, any times your shoes are a bit damp, chuck a few gel packets in there overnight.
05:19You might have been using your shampoo wrong this whole time.
05:23Really?
05:23Here's the gist.
05:25Don't apply it to your hair.
05:27Just apply it to the roots.
05:28The foam you create will trickle down on your hair anyway.
05:33Notebook margins aren't for taking extra notes or practicing emojis.
05:37They were invented to protect people's work.
05:40People used to live with a lot of hungry rats around.
05:44The rats would nibble at the paper, eating people's work.
05:47They put the margin lines there to let people know to start their writing further from the edge,
05:52so it's not lost to a hungry rodent.
05:55Solo cups are the key element for any barbecue party.
05:59But these red cups are even cooler than you thought.
06:02You can use them to measure liquids.
06:05The bottom line equals 1 ounce, the second line equals 5 ounces, and the third line equals 12 ounces.
06:13If you like milk on your tea, try this tip out next time.
06:17Pour it from the other side of the carton.
06:19It sloshes around less, and it's easier to control.
06:24Car headrests are all about comfort, and detachable headrests are all about safety.
06:29If you pull the headrest out, you'll see two sturdy metal bars.
06:34If you ever get locked or trapped in a car, you can use the bars to smash the window and
06:39get out.
06:41Women's shirts have their buttons on the left, even though about 85% of people are right-handed.
06:47It would make way more sense to have them on the right.
06:51The thing is, back in the day, wealthy women had maids to help them dress.
06:56So, for them, the buttons on the left made things much easier, don't you know?
07:03The tab on your rear-view mirror does have a real function, people.
07:07It holds your air freshener, your huge fuzzy dyes, maybe a big smiley emoji.
07:13But it's actually a switch between day and night mode for your mirror.
07:17When it's dark out, the night mode blocks the glare from the car behind you.
07:23The McFlurry spoon has a square handle on it.
07:26It gets attached directly to the ice cream machine, and the ice cream and toppings get mixed in together, right
07:32in your cup.
07:33It saves the employees loads of time, plus it saves water, because they don't have to wash the machine after
07:39each one.
07:41Wooden hangers are so hot right now, they could burn up your clothes.
07:46Nah, not really, but they look better and are more natural.
07:49But there's another reason to use them.
07:52They're made of cedar, which is a natural moth repellent.
07:55Bonus tip?
07:56Add some dry orange peel to your closet.
07:59No moth is ever going in there again.
08:03So, you hungry, but not quite ready to eat a three-course meal just yet?
08:08How about some instant noodles instead?
08:11Ah, the water's boiled, your tummy's rumbling, but there's a problem.
08:15The styrofoam cup's broken, and the noodles are exposed.
08:19Wait, is that a space at the bottom of the cup?
08:22Why?
08:23That space is for protecting the noodles.
08:25It's not the company trying to save money or anything.
08:28Notice how the ramen in cups is hardly ever broken, but the one in the packet comes out looking like
08:33a mess?
08:34This technique is called a middle suspension.
08:37The noodles are packed in tightly to stop them from getting crushed in the delivery truck.
08:41It's not just about the noodles looking nice and long.
08:45It also helps those tasty noodles soften more easily.
08:49Now, morning breath isn't the best.
08:51Luckily, there's an easy way to get rid of it.
08:54Yeah, it would have been easy to think that mouthwash was invented for, you know, watching your mouth.
08:59Well, mouthwash was originally invented and sold as a floor cleaner.
09:04It was sold to hospitals as an antiseptic for years.
09:08It never really took off.
09:10Some genius in marketing rebranded it as a mouthwash.
09:13And the rest is minty fresh history.
09:16So, after you've cleaned your teeth, just remember, rebranding can be pretty powerful.
09:22It's hard to imagine a world without the internet these days.
09:26No streaming, no online games, or pictures of cute little kitties.
09:30Yeah, that's not what it was designed for.
09:32But who cares, right?
09:34The prototype internet was called ARPANET, or the Advanced Research Projects Agency Network.
09:41This machine was very sensitive.
09:42To stop anyone from turning it off, some clever scientist stuck a piece of paper on it with these powerful
09:48words.
09:49This machine is a server.
09:51Do not power it down.
09:52It was written in red ink.
09:54Hey, nice touch.
09:56Having your professor scribbling in the margins of your notebook isn't exactly new.
10:01Except that margins weren't designed for that.
10:04They're rat protection.
10:06Back in the day, rats would nibble on paper all the time.
10:09So, if you wrote something on the edge of the paper, it ended up inside a hungry rat.
10:14A couple of well-placed lines stopped your best answers from getting eaten.
10:20Hey, I can't finish this pizza.
10:22Time to cover up those leftovers.
10:24Luckily, I have plenty of plastic wrap.
10:27A little tug, and the roll just jumped out.
10:30Prison break!
10:31If you look at the wrap's home, the long, thin box, there's a special little feature that can help you.
10:37A cardboard tab on each end.
10:39Push them in, and the roll's not going anywhere.
10:43Strange that I've never seen them before.
10:47It's lunchtime.
10:48I'm feeling like a California roll today.
10:51Seaweed, rice, cucumber, avocado, and crab meat.
10:55Or is it?
10:56It's actually imitation crab meat.
10:58It's basically cheap white fish blended with sugar.
11:02The fish mixture is then heated and pressed into shape.
11:05Mmm, yummy!
11:07That's maybe why it's called the hot dog of the sea.
11:10Nah, I just made that up.
11:13Your microwave has a secret we've all seen, but never paid attention to.
11:18That black mesh you see on the door is a Faraday cage.
11:22It stops the electromagnetic energy, or the microwaves, from escaping.
11:26And cooking you, too.
11:28That's how it heats up your food so quickly.
11:31Every microwave has to have one, and they all vary in quality.
11:35This Faraday cage can even stop signals from your phone.
11:38Which I guess is useful.
11:40Hey, you don't need your popcorn to stop popping in order to take a call, do you?
11:44Airplane mode's a bit easier, though.
11:48Ever taken an IQ test and realized you're Einstein-level smart?
11:52Me neither.
11:54The median IQ is only 100.
11:56Plus, there's very little evidence that Einstein ever even took the test.
12:01In the beginning, most people thought the tests were too vague to be helpful in any way.
12:06The test was designed for children who needed help with their studies.
12:09Later, they realized it could be adapted to identify intelligence.
12:13But it was never originally designed for that.
12:17Hey, never pop bubble wrap.
12:20You're missing out.
12:21And you guessed it.
12:22It was never meant to be popped or used in the way we use it today.
12:26It was invented as a new, textured wallpaper.
12:29By sealing two shower curtains together, they created the first bubbles.
12:34The idea never really took off, obviously.
12:37After failing as wallpaper, it discovered its true meaning in life.
12:41It could protect sensitive items.
12:43When the first computers were being shipped, bubble wrap was there to help.
12:48Imagine a house with bubble wrap wallpaper in every room.
12:51Best or worst thing ever?
12:53Hey, leave me a comment below.
12:55If you owned one of the biggest companies in the world,
12:58selling one of the most known products on the planet,
13:01how would you keep your company's secret a secret?
13:04The formula for Coca-Cola isn't patented.
13:08The first recipe was, but when they made changes, no patent ever went through.
13:13The secret formula is still only known by a few people at the company.
13:18Not only that, but not even Coca-Cola's rival wants the recipe.
13:23In 2006, a disgruntled employee tried to sell off the secret, but it didn't work.
13:30Hey, take a look at your brand new mattress.
13:33Do you see the Do Not Remove Under Penalty of Law tag?
13:36Wow, that thing looks pretty serious.
13:39Good news, though.
13:40The tags aren't meant for you.
13:42They're aimed at the mattress seller.
13:44A hundred years ago, mattress makers used to create the filling with basically anything.
13:49Animal hair, old hospital beds, or clothing.
13:52Then, strict laws stopped old hospital beds from being used.
13:56Their mattresses were filled with germs.
13:59Now, on a rainy day, Play-Doh is something everyone can make at home.
14:04Mash up some flour, water, salt, food coloring, and wham!
14:09Any creative person is amused for hours.
14:12Cheap, clean, non-toxic, the perfect modeling clay.
14:15But it was never made for that.
14:18This stuff was originally for cleaning up walls in the 1930s.
14:22That's because people started going crazy for wallpaper, which you couldn't use soap and water on.
14:27Eventually, Play-Doh had to find a new home.
14:31Now, have you ever finished a lollipop and noticed a hole in the stick?
14:36This hole isn't just for show or to make a musical instrument with after you're done.
14:41It's there to keep that tasty sweet treat from falling off.
14:44While the candy's still hot, it's poured into a mold.
14:48As it hardens, the candy flows into the hole and creates an anchor.
14:53Oh, not into lollipops?
14:55How about good old American gummy bears?
14:58Unfortunately, they aren't American at all.
15:00They're German.
15:01A German company started making them in 1922.
15:05The original name was Gummy... something-something.
15:09Anyway, they got the inspiration from real dancing bears at live shows.
15:13These treats eventually made it all the way around the world.
15:18Hey, ever wondered what those little bumps were for on the F and J keys on your keyboard?
15:23These little raised ridges are to help your index fingers be in the best possible spot for lightning-fast typing.
15:30Keeping those fingers on F and J, it makes it way easier to reach all the keys, especially if you
15:36don't look at the keyboard.
15:38Now, everybody loves a slinky.
15:40If you've ever watched one of them strut down the stairs with groovy music in the background, congrats!
15:46You're definitely a YouTube fan.
15:48People of all ages loved it when it came out.
15:51Which is crazy, because it was never meant to be a toy at all.
15:55It's a spring.
15:56It was originally designed to stabilize sensitive nautical devices on ships.
16:02Nothing fun about that at all.
16:03Until that amazing day, when one of them fell off a table and danced its way into our hearts.
16:10After many experiments, the new and improved Slinky was born.
16:14Give that team of scientists a medal.
16:17Now, that little pocket on your jeans wasn't designed for loose change or keys.
16:22It was originally made to store your pocket watch.
16:25You don't have a pocket watch?
16:27How is that possible?
16:28They were all the rage in the 1890s.
16:31But that's not all that makes your old pair of jeans interesting.
16:35Look around the pocket areas.
16:37You'll see rivets sticking out.
16:40No, they're not some cool fashion idea from the past.
16:43These rivets serve a very crucial role.
16:46They help protect the sensitive areas of the jeans that get the most wear and tear.
16:50Back in the day, most people wore jeans to do hard manual labor.
16:54So, they needed to be tough.
16:56If those guys back then saw you paying $100 for a pair of ripped jeans,
17:01they'd probably pass out from shock.
17:04So, get this.
17:05An extra hole at the upper part of the sink has multiple hidden functions.
17:10First, in case someone forgets to close the tap,
17:13the water won't overflow and the bathroom won't get flooded.
17:16Second, thanks to that hole, the water drains faster
17:19as it gives an escape for the air helping the water flow down.
17:23Those two holes on the side of any Converse shoe
17:26are not there only to let the stinky air out.
17:29Sure, breathability is important for any athlete.
17:33But the second reason is that athletes lace through those holes to get a better grip.
17:38Donuts have a hole in the middle, and it doesn't stand for O in donut.
17:42It's not designed for an easier grip either, although it can be quite convenient.
17:46It's actually made this way for mass baking,
17:49so that they cook all the way through evenly.
17:53Most metallic zippers have a hidden lock inside them
17:56to save you from awkward situations such as an undone fly.
18:00Oh boy.
18:01Don't leave the zipper handle in an upward position.
18:04When you pull it downwards, it automatically locks.
18:07It's all thanks to those tiny grooves hidden underneath the handle.
18:12Almost any public toilet has a large gap between the floor and the door.
18:17The reason for such a zero-privacy thing is to actually minimize the level of privacy and comfort,
18:23so that people wouldn't stay there long and there'd be no lines.
18:27It's also easier to clean and safer if some emergency occurs.
18:32Spoiled milk emits gases, like most foods when they go bad.
18:36A classic plastic milk jug has a concave shape on one side.
18:40So when the gases expand inside the jug, it expands too, and the concave shape curves out.
18:47Also, if you want to save some milk for later and freeze it,
18:50the jug will expand when the milk gets solid as well, occupying more space in a jug.
18:57Headrests in a car are about comfort, and detachable headrests are about safety.
19:02If you pull the headrest out of the seat, you'll see two bars, which are quite sturdy.
19:07If you ever get locked or trapped in a car,
19:09you can get out of there smashing the window with one of these bars.
19:14Bath foam isn't only for fun or a nice smell.
19:17It also helps regulate the temperature.
19:19The bubbles keep the water hot, so you can enjoy a bath a bit longer.
19:23Anyway, it works for acrylic bathtubs only.
19:26Those made of metal lose heat really fast either way.
19:31Many cups and mugs have little grooves on the bottom on purpose.
19:35They're designed for dishwashing machines.
19:38The grooves let the water flow and not spill over your feet when you take the cup out.
19:43Also, those grooves let the air flow, so the cup doesn't crack even if the tea is scalding.
19:49Almost all measuring tapes have a metal tip with a small slot on the end.
19:54You can use this slot to hang the tape on a nail or a screw and make measurements without anyone's
19:59help.
20:00Sometimes, this tip has a row of sharp points along the edge on one side.
20:05That comes in handy when you want to leave a mark without using a pencil.
20:10Doorknobs are usually made of brass, bronze, and some other copper alloys for a reason.
20:15They have an antibacterial effect, so they stop microbes from spreading.
20:19They get rid of a range of harmful germs pretty fast, within a couple of hours.
20:24But don't forget to wash your hands anyway.
20:27Grocery carts have loops for a reason.
20:30You don't want to put your jacket in a cart next to potatoes and onions.
20:33Hang it on a loop.
20:35This little hook-like thing is here to help you better organize the space in your cart.
20:40The carts also have a super handy grid.
20:43Whenever the cart's full, you just need to lift the grid and attach the shopping basket for extra purchases,
20:49placing it in between the horizontal bar above the wheels and the hook the grid has.
20:55A point on an ointment cap is there for a reason too.
20:58Most tubes are usually sealed with foil, and it's better to avoid opening it with fingers unless you're ready to
21:04say goodbye to your nails.
21:06A point easily opens even the most safely sealed tube.
21:11A pack of cotton pads has those strings on it so that we could hang it on some hook or
21:16holder.
21:16And no, there's no need to untighten and tighten the pack again.
21:20Look at the bottom of the pack.
21:22It has a perforated line.
21:23Tear along it, and now you're good to pull out a cotton pad.
21:28If you've ever tried a Nintendo cartridge to taste, you'll confirm that they taste revolting, leaving a sour, bitterish aftertaste
21:37in your mouth.
21:37They're covered with denotonium benzoate, one of the most disgusting flavors ever known.
21:44Actually, this taste is kind of a hidden function.
21:46It prevents people from swallowing those cartridges.
21:50Silica gel can often be found in different things you buy, like bags, shoes, and many others.
21:56Don't throw it away.
21:57It's meant to absorb excess moisture, so anytime your shoes are a bit wet, just throw in a packet with
22:03silica gel.
22:06Escalator brushes aren't for keeping your shoes clean or polished.
22:10It's for our safety.
22:12Brushes won't let you come close to the edge, so a long coat or bootcut jeans won't end up between
22:18the steps.
22:19Rough edges on the dimes aren't just about design.
22:23The coins used to be made of precious metals to show their real value.
22:27People would shave off the edges, spending the shaven coins with the same value, and melt the edges into new
22:33coins.
22:34To avoid it, minters added that pattern so people could tell if someone cut that coin before.
22:40Ever notice a tiny hole on the bottom of a padlock?
22:43Its hidden purpose is to drain water to help avoid corrosion.
22:48It's always the most convenient place to lubricate a padlock.
22:51A drop of oil in there will make it open and close easier.
22:55Bottles have long necks for a reason.
22:58Hold the neck, not the bottle, if you want to enjoy a cold drink.
23:02Same goes for fancy glasses.
23:04Their stem saves any drink from overheating.
23:07So, hold it right.
23:10Notebook margins are not some extra space for note-taking.
23:13In fact, people invented them to protect their notes.
23:16People used to co-live with rats, and these guys like gnawing on everything they see on their way, including
23:23paper.
23:24Still, rats weren't able to chew more than the space left on the margins.
23:29That black grate on a microwave isn't just some fancy decoration.
23:33It's called a Faraday shield.
23:36And it prevents the rays from escaping the microwave.
23:39It also speeds up the heating, so you could enjoy yesterday's leftovers faster.
23:43It may also block phone signals, so if you're tired of numerous calls, just put the phone into a microwave.
23:50But don't turn it on.
23:52All Tic Tac containers are designed to dispense one Tic Tac every time you open it.
23:57The lid has the same shape as the candy.
24:00Turn the container upside down, gently shake it, and slowly open it.
24:04You'll notice only one candy stuck between those lid grooves.
24:08So, if you just open the container and shake it until five or more candies fall into your mouth,
24:13that means you've been eating Tic Tac wrong all this time.
24:17Those little holes in the airplane windows are designed to control the cabin pressure.
24:22They also protect the windows from fogging up as the temperatures drop and rise.
24:27By the way, the airplane window is round for a reason.
24:31This way, pressure is evenly distributed, so it doesn't get deformed.
24:35Blue bristles on a toothbrush are actually an indicator that it's just about time to change the brush.
24:41As the bristles get in contact with water, the blue or whatever other pigment fades away.
24:47So, the more you use it, the duller the color becomes.
24:51A triple handle on a jerry can is there to make it easier for two people to carry it and
24:57distribute the fuel evenly.
24:59Gas cans often have a second hole that actually needs to be uncapped too before you pour the gas.
25:04The air passage will prevent it from pouring out, so no more fuel waste.
25:10The tab on the rearview mirror does have a function.
25:13It holds your air freshener, a pair of foam dice, your graduation tassel, and some other useful stuff.
25:20But in fact, it works as a tumbler between day and night mode.
25:24It helps hold the glare from the car behind you.
25:26Those car lights can blind you.
25:30In a supermarket, you pass by a shelf with eggs and try to decide which ones are better, the white
25:36ones or the brown ones.
25:37There's practically no difference between them.
25:40The egg's color depends on the breed of the chicken.
25:42These birds produce two different color pigments.
25:45You can take eggs of any color because the nutritional components of the eggs are almost the same.
25:50So, what came first, the brown egg or the white egg?
25:54Eh, never mind.
25:56It's enough to use a small amount of toothpaste to brush your teeth, the size of a pea.
26:01But the ads show that you have to cover the entire toothbrush with paste as a marketing ploy.
26:07Manufacturers want you to buy a new tube faster.
26:10A plane leaves white lines behind in the blue sky, thanks to the condensation of carbon dioxide, steam, and burning
26:17fuel.
26:18In winter, heated air visibly comes out of your mouth.
26:21The same principle works here.
26:23It's always icy at the altitude where planes are flying.
26:27Exhaust and hot air comes out of the turbines.
26:29When it collides with cold air, it creates thick lines of steam.
26:34Almost all hotels have white bedsheets.
26:37They choose this color specifically to show how high their standards of cleanliness are.
26:42The whiter and brighter the sheets are, the more luxurious the hotel seems.
26:46It's much easier to see dirt and stains on white linen.
26:49It's like proof that you've checked into a cleaned room.
26:53Gasoline looks like a rainbow in a puddle because it can't mix with water.
26:57It forms a thin membrane over it.
27:00When light reflects from it and the water at the same time, you've got a rainbow.
27:05The Do Not Disturb sign on your hotel room door is not a requirement but just a suggestion.
27:11Maids and staff have the right to go there if they suspect something's wrong.
27:16Especially if you don't remove the sign for 24 hours.
27:19Why do clocks go to the right?
27:21The sun is the main reason.
27:23In ancient times, when people invented the sundial,
27:26the sun's shadow was moving to the right in the northern hemisphere
27:30and to the left in the southern hemisphere.
27:33Mechanical clocks were first invented in the northern hemisphere.
27:36So, it always goes right.
27:38Or, as we now say, clockwise.
27:41Why are the cups at parties colored red?
27:44Because it helps you quickly find your drink on the table among snacks and drinks.
27:48And all those other red cups.
27:50Here's a hint.
27:51Write your name, Michael, on the cup.
27:53If your name is Michael.
27:55Also, red is considered a color that provokes action.
27:58At the psychological level, it seems the red cup is commanding you,
28:03Hey, drink me up!
28:04They believe yellow taxis have their roots in 15th century Italy.
28:09One postal businessman used yellow cabins for delivering mail.
28:13He wanted everyone to recognize his carts.
28:16About 60 to 80% of people, mostly aged 15 to 25,
28:21occasionally have goosebump-induced déjà vu moments.
28:25It's fleeting and unpredictable,
28:27and scientists are still not 100% sure why it happens and can't control it.
28:32To understand it better, they tried to create memories for patients under hypnosis.
28:38Then, they asked them to forget or remember the memory,
28:41and it made them experience déjà vu later.
28:44Other scientists tried to recreate it in virtual reality with scenes and games that looked alike.
28:49The experiments made them believe déjà vu is your memory playing tricks on you.
28:54You get into a situation that's similar to a real memory that you have,
28:59but you can't remember it completely.
29:01Your brain notices the similarities and leaves you with a strange feeling of already seen.
29:06That's how déjà vu translates from French.
29:10Another version is that it's a memory glitch.
29:12It's more likely to happen when you're stressed.
29:15So, when you're under pressure or have a lot of information to process at once,
29:19some of it can end up in long-term memory instead of short-term memory.
29:24So, you take your best friend Max to the doggy park.
29:27He meets the labradoodle of his dreams, and they start playing together.
29:31Peaceful tail wagging quickly grows into biting each other.
29:35Oh no, they're going for the necks!
29:38You grab Max and rush back home.
29:40Well, in fact, there was no need to rush home.
29:43Playing with open mouths is called mouth wrestling or jaw sparring.
29:48It's a healthy way of interaction between dogs.
29:51They inherited this habit from their wolf ancestors.
29:54When a dog is a puppy, it has to learn some important skills, including fighting.
29:59Mouthing is just an imitation of it.
30:01When a puppy matures, it will know how to protect itself and respect boundaries of other doggos.
30:07All the chasing, wrestling, growling, and face-biting is a way to socialize with others and have fun in the
30:13dog world.
30:14It's something like sibling rivalry and playful fights in the human world.
30:19Cute kittens and cats under the age of two also practice mouthing.
30:23They often tumble over each other and bite one another's necks to let their hunter instincts out.
30:28In the wild, cats are fast and merciless, and they can't hide it behind all the purrs in the world.
30:36Playbiting with other kitties can also teach your little Mr. Biscuit to be more gentle when it plays with you
30:41and other humans.
30:42So, it's all good.
30:44Cats like to sharpen their claws on your furniture to leave a visual mark on their territory.
30:49They also do it to let their claws renew and stretch their back and shoulders.
30:53The couch seems perfect for it, because it's not too short and is sturdy enough.
30:58Well, you gotta find a good replacement with the same qualities to let your kitty scratch and release its emotions.
31:05Cats freak out when they see a cucumber because it looks too much like their long-time enemy, snakes.
31:11They're naturally programmed to jump up in the air to protect themselves from a bite.
31:16Anything that looks similar, from toys to eggplants, causes a similar reaction.
31:21It's never a good idea to show them things like that for fun.
31:24It can really mess up their mental health.
31:27Fish have gills and fins, but they don't have necks.
31:30Instead, they have a series of bones that connect their skull and shoulder girdle.
31:36One of the reasons for that is it would be really hard to be fast while swimming if they had
31:41a neck waggling back and forth.
31:43Plus, the moment a creature similar to a fish developed a neck,
31:47science automatically classified it as another group of animals.
31:51That means the official definition says if a creature has a neck, we can't call it a fish.
31:56The oldest neck scientists have on record belongs to one unusual creature that lived 375 million years ago.
32:04It was part fish and part tetrapod, which is a term for an animal with four limbs.
32:10Now, rain won't always make the ground wet.
32:13There are very hot and dry areas where rain can evaporate even before it gets to the ground.
32:18It's something called phantom rain.
32:20You can see dense curtains of drops coming from above, but at the same time, nothing's on the ground,
32:26and none of the water reaches the living beings.
32:30Rats laugh when you tickle them.
32:32They mostly giggle when being tickled, and during one experiment where researchers tickled them,
32:37they even chased after their hands in a playful manner.
32:40All of the great apes, which is a group that includes gorillas, orangutans, bonobos, and chimpanzees,
32:46are ticklish too, and generally respond to tickling with a pretty distinctive human-like laugh.
32:51Penguins, dogs, meerkats, and many others also seem to pretty much like it.
32:57Different nations have different systems when it comes to vehicle registration, including license plate color.
33:04Australia goes with an unlimited palette when it comes to plates.
33:07They include many different motifs and designs.
33:10In the UK, cars have two possible number plate colors, yellow at the back of a vehicle and white at
33:17the front.
33:18Both have black characters.
33:20Now, it wasn't always like this.
33:22Number plates in this country used to have either white or silver characters.
33:26But starting from 1979, all vehicles must have the exact plates we see today for a reason.
33:32Every registration plate must be made from reflective material.
33:36So, if the number plate at the back of your car is white, it might reflect white light, which is
33:42not legal.
33:43Elephants have enormous ears, and normally they can hold them out to scan noise back and forth.
33:48But there are sometimes distant vocalizations and noise they can hear with their feet.
33:54When they detect something that's far away, elephants freeze and lean forward.
33:59They transfer weight to their front legs and may even lift up a front foot.
34:03Hmm, hearing with your toes, that's quite a feat.
34:07Hmm.