Name: The Unexpected Reason Why Escalators Have Brushes
Uploaded: 2020-03-15T06:12:51.000Z
Duration: 8 min 50 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Ever been in that awkward situation when you're in a room with people you barely know, and

Well, why don't you tell everyone why snow crunches?

Or why escalators have brushes along the edges?

Sloths are the slowest animals in the world - and I'm not only talking about how they

It takes these sleepy mammals up to a month to digest a single leaf!

Most of them also go to the bathroom just once a week.

For comparison, depending on the kind of food, people need just 12 to 48 hours to eat a meal,

The burning sensation you have in your mouth after eating chili peppers is caused by a

It tricks your sensory nerves into believing they're being burned.

Some small birds and insects see the world in slo-mo because they process information

For some big animals, on the other hand, time is literally flying by because they need more

If you think your cat loves to catch some Z's, what will you say about koalas?

These marsupials sleep from 18 to 22 hours a day!

They spend a lot of energy digesting their high-fiber food, and napping is a great way

Have you ever got chills while listening to music?

It was your brain releasing dopamine - a chemical compound that causes pleasure.

You know those tall white hats chefs wear?

They're called toques, and the number of pleats on such a hat (which is traditionally 100)

signifies a chef's experience - for example, the number of recipes they can use to cook

If you're allergic to cats, consider this: cats can also be allergic to you!

The only reason this allergy doesn't show so often or isn't that prominent is that you

don't shed as much irritating hair and skin as they do.

Elevators ding when they're at your floor to inform you about their arrival.

If you listen carefully, though, you might notice that some elevators produce a different

Usually, one ding means the elevator is going up, and two dings - that it's traveling down.

Continental plates keep drifting at the same speed your fingernails grow.

An underground activity that makes them move also causes volcanic eruptions and earthquakes.

In total, tectonic plates end up traveling up to 2 inches a year.

You've probably noticed that the colder it is outside, the louder the snow crunches under

It happens because when the snow compresses, teeny ice grains rub against each other.

The lower the temperature, the greater the friction between the ice grains, and the louder

Hey snow, can you hold it down over there?

Adult cats only meow to communicate with us humans.

Kittens can meow at their moms, but grown cats don't interact with each other this way.

Scientists have even found that these animals are great manipulators when it comes to cat-human

Cats can change the pitch of their meows so that they sound more like crying babies.

They've long figured out that this way, they get more food and attention.

A reindeer's eyes change color from gold in the summer to baby blue in the winter.

Such a color shift improves the animals' vision because it influences the way the light gets

Escalator brushes weren't designed to clean our shoes.

They were invented for much more important safety reasons.

You see, escalators tend to break when people stand too close to their edges.

Between the side of an escalator and the wall, there’s a gap.

It's almost unnoticeable, but if something, like a piece of clothing, gets inside, it

may get stuck in the maze of motors and gears.

Then the escalator could not only break down but also damage the foreign object.

Escalator brushes prevent such accidents by scaring you away from nearing the gap.

As soon as you feel the bristles on your leg, you instinctively move away.

Just one bolt of lightning will provide enough energy for a two-slice toaster to work for

It's enough time to cook almost 100,000 slices of toast.

Getting goosebumps when you're frightened goes back to the times when you could only

fend off a predator if you looked scarier than your opponent.

When you get goosebumps, all the tiny hairs on your body stand up, supposedly making you

Roosters can be exceptionally loud, and the question is, "How do they not go deaf if this

thundering noise is coming right out of their beaks?"

Simple - they have a natural mechanism that works as built-in earplugs!

Once a rooster opens its beak and gets ready to crow, its auditory canals close off, and

The sound they produce is similar to the one made by fizzling soft drinks.

Melting icebergs or glaciers set free millions of tiny air bubbles that’ve been trapped

in the ice under huge pressure for centuries.

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The Unexpected Reason Why Escalators Have Brushes

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