During sleep, there is point activity of the same neural patterns as during play.

This suggests that during sleep, our brain reproduces our experiences, which helps it remember information and record memories.

World of Knowledge 🌎

Hedgehogs' needles grow at about the same rate as our hair grows.

Hedgehogs also have regular hair between the needles, but you can only notice them with a close inspection, because they are thin and very sparse.

World of Knowledge 🌎

Penguins react painfully to flying helicopters.

They raise their heads and lean back, and since their necks are short and their bodies are clumsy, they often fall on their backs. Penguins can not roll over and stand up on their own, and can even die.

That is why a specialist, by profession, comes to their aid - a penguin flipper.

World of Knowledge 🌎

When the first vacuum cleaners were invented, many carpet lovers accused their inventor Hoover of cheating.

People refused to believe that their favorite carpets contained so much dust.

World of Knowledge 🌎

The television series "Friends", even when it stops airing, earns a billion dollars a year.

This is the income from the purchase of the rights to the series by TV channels around the world. Each of the actors who played major roles receives a 2% royalty, which is about $20 million a year.

World of Knowledge 🌎

Margins in notebooks and books were added to protect the work from rats.

In the old days, when rats lived in almost every house, they used to nibble the edges of books and notebooks. The presence of margins preserved, if not the book, then the text of the work itself.

World of Knowledge 🌎

The largest angle of rotation of the feet

Briton Maxwell Day has an amazing ability, he can turn his feet to 157 degrees, thanks to the excessive mobility of the joints.

World of Knowledge 🌎

The only country named after a woman is Santa Lucia.

It is an island nation located on the island of the same name in the Naval Islands of the West Indies between the islands of St. Vincent and Martinique.

World of Knowledge 🌎

If a person walks an average of about 10,000 steps a day.

If you add up that distance, you get about 170,000 kilometers in a lifetime - enough to go around the globe more than four times.

World of Knowledge 🌎

Chocolate has long been a currency.

At the beginning of our era, ancient civilizations living in South Africa and Mexico used cocoa beans in the monetary system.

World of Knowledge 🌎

This is how the aerodynamics of vehicles are tested

This method is a wind tunnel. Where they reveal the reduction of air resistance, reduction of noise level, prevention of lifting forces.

World of Knowledge 🌎

Fantastic view: Falcon 9 rocket leaves the atmosphere, creating a "twilight phenomenon"

World of Knowledge 🌎

Rotterdam Zoo Gives Visitors "Look at the Ceiling" Glasses

After a gorilla broke out of its enclosure and attacked a woman in a zoo in Rotterdam, Holland, visitors were given goggles with pictures of eyes looking into the upper left corner.

The "look at the ceiling" style glasses are needed to avoid eye contact with primates, for whom a straight look is a manifestation of aggression. They see through the small holes in the middle of the lens.

World of Knowledge 🌎

Almonds are not nuts

Many people think that the fruit of almonds is a nut, in fact, it is not. Almonds are a plant of the plum family. This means that an almond "nut" is the kernel of a stone fruit, much like a plum or apricot.

Only in almonds, all the flavor has "gone" from the pulp to the kernel of the stone.

World of Knowledge 🌎

When a bird sits on a branch to sleep, its muscles contract, tendons tighten, and claws clench.

During sleep, the body is motionless, so the branch is tightly clenched by the claws. When the bird wakes up, it straightens out and the locking mechanism simply opens!

World of Knowledge 🌎

It's better not to catch it⚾

A released baseball. The velocity of which is 1000 miles per hour.

The mass of the baseball is known and approximates m = 0.145 kg.

Just imagine the force of hitting a person or hand while trying to catch the ball.

World of Knowledge 🌎