WHY does a dolphin sleep with one eye open?
Dolphins are able to sleep by alternately turning off one of their hemispheres. The other hemisphere is awake at that moment. Accordingly, one eye is open in order to monitor changes in the environment.
If the right hemisphere sleeps and the left one is awake, the right eye is open. And vice versa.
Dolphins are able to sleep by alternately turning off one of their hemispheres. The other hemisphere is awake at that moment. Accordingly, one eye is open in order to monitor changes in the environment.
If the right hemisphere sleeps and the left one is awake, the right eye is open. And vice versa.
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WHY does the British Queen lack of a passport?
Even though the Queen does not have a passport, she is free to travel around the world.
Since UK passports are issued in Her Majesty's name, the Queen does not need one. All other members of the royal family have passports.
Also, the Queen is the only person in Great Britain who is allowed to drive a car without a license.
Even though the Queen does not have a passport, she is free to travel around the world.
Since UK passports are issued in Her Majesty's name, the Queen does not need one. All other members of the royal family have passports.
Also, the Queen is the only person in Great Britain who is allowed to drive a car without a license.
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WHY are Japanese suicide bombers called kamikazes?
The Mongol khan Kublai twice planned an invasion of Japan, and both times he was prevented by violent typhoons.
The Japanese saw this as a help from above and called them "kamikaze," which means "divine wind." And in World War II they used the term to describe suicide pilots.
The Mongol khan Kublai twice planned an invasion of Japan, and both times he was prevented by violent typhoons.
The Japanese saw this as a help from above and called them "kamikaze," which means "divine wind." And in World War II they used the term to describe suicide pilots.
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WHY do calculators start at the bottom and the phone starts at the top?
The calculator is the successor of cash registers and mechanical counting machines. That's why the numbers on the calculator from zero to nine are from the bottom to the top.
Until the 1960s, dialing on the telephone was done with a dial. Then tone dialing became possible, and the familiar dial was replaced by buttons.
There were many different attempts: they were arranged in a circle, or in two rows... But as a result, the familiar option was chosen, where the numbers are arranged in three rows in ascending order (from top to bottom).
The calculator is the successor of cash registers and mechanical counting machines. That's why the numbers on the calculator from zero to nine are from the bottom to the top.
Until the 1960s, dialing on the telephone was done with a dial. Then tone dialing became possible, and the familiar dial was replaced by buttons.
There were many different attempts: they were arranged in a circle, or in two rows... But as a result, the familiar option was chosen, where the numbers are arranged in three rows in ascending order (from top to bottom).
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WHY are extroverts and introverts ideal life partners?
➡️ Extroverts tend to be active, sociable people. They easily establish contact with others. They can also be inspiring and encouraging.
➡️ Introverts are quiet ones. Take a long time to think through decisions, analyze all options. Able to avoid problems.
Therefore, calm introvert keeps from making rash decisions, and temperament extrovert rouse the other half.
➡️ Extroverts tend to be active, sociable people. They easily establish contact with others. They can also be inspiring and encouraging.
➡️ Introverts are quiet ones. Take a long time to think through decisions, analyze all options. Able to avoid problems.
Therefore, calm introvert keeps from making rash decisions, and temperament extrovert rouse the other half.
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WHY is everything colored green in night vision devices?
In traditional night vision devices (not thermal imagers), light entering the lens is converted into shades of black and white, and only when it hits the phosphor screen does it take on a greenish hue.
The green gamut is chosen for two reasons:
✔ the human eye is most susceptible to waves of this length.
✔ it is the least tiring to the eye for prolonged exposure.
In traditional night vision devices (not thermal imagers), light entering the lens is converted into shades of black and white, and only when it hits the phosphor screen does it take on a greenish hue.
The green gamut is chosen for two reasons:
✔ the human eye is most susceptible to waves of this length.
✔ it is the least tiring to the eye for prolonged exposure.
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WHY are the ribs of coins notched?
Coins used to be valued according to the amount of metal they contained. Fraudsters used to cut the metal off the edges, pocketing the gold and silver. It was incredibly difficult to catch them.
A solution to this problem was suggested by Isaac Newton, who was an employee of the British Royal Mint. He suggested making fine notches on the edges of the coin, which made the worn edges immediately visible.
Coins used to be valued according to the amount of metal they contained. Fraudsters used to cut the metal off the edges, pocketing the gold and silver. It was incredibly difficult to catch them.
A solution to this problem was suggested by Isaac Newton, who was an employee of the British Royal Mint. He suggested making fine notches on the edges of the coin, which made the worn edges immediately visible.
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WHY does the skin on fingers get wrinkled in water?
Our distant ancestors used to extract from water bodies not only food, but also household items. No special equipment was available, so they had to do it with their bare hands.
Skin wrinkling on palms and fingers made the task a lot easier and changing the skin on feet simplified moving over underwater rocks and other slippery surfaces.
Our distant ancestors used to extract from water bodies not only food, but also household items. No special equipment was available, so they had to do it with their bare hands.
Skin wrinkling on palms and fingers made the task a lot easier and changing the skin on feet simplified moving over underwater rocks and other slippery surfaces.
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WHY do cats purr?🐈
The sound and vibration are created by the muscles inside the cat's larynx.
When they move, the vocal cleft expands and contracts. The air vibrates every time the cat inhales and exhales.
What do we end up with? Purring.
The sound and vibration are created by the muscles inside the cat's larynx.
When they move, the vocal cleft expands and contracts. The air vibrates every time the cat inhales and exhales.
What do we end up with? Purring.
WHY don't mice like cheese?
Contrary to popular myth, mice are not as big a fan of cheese as they are often portrayed in cartoons and even movies.
The basic diet of mice, like other rodents, consists of grains, seeds, pieces of vegetables, fruits and sweets. In addition, many cheeses have a pungent odor that is more likely to scare away a mouse.
Contrary to popular myth, mice are not as big a fan of cheese as they are often portrayed in cartoons and even movies.
The basic diet of mice, like other rodents, consists of grains, seeds, pieces of vegetables, fruits and sweets. In addition, many cheeses have a pungent odor that is more likely to scare away a mouse.
WHY is limescale in the kettle not considered harmful to humans?
If a person swallows some scale, he or she will only get an unpleasant feeling in the mouth. Limescale is mainly calcium and magnesium salts, physiologically inactive due to their insolubility.
However, these layers do not conduct heat well: settling on the heater, they increase the boiling time of water and are harmful only to the kettle itself.
If a person swallows some scale, he or she will only get an unpleasant feeling in the mouth. Limescale is mainly calcium and magnesium salts, physiologically inactive due to their insolubility.
However, these layers do not conduct heat well: settling on the heater, they increase the boiling time of water and are harmful only to the kettle itself.
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WHY is business class located in the front of the plane if it's safer in the back?
The probability of surviving a crash in the back of a plane is not much higher than in the front seats, only a few percent. Considering that plane crashes are rare (once per million flights), this difference can be neglected.
More important are the advantages of the front seat: quick landing and disembarkation, lower noise level and the view from the porthole, which is not obscured by the wing and the engines.
The probability of surviving a crash in the back of a plane is not much higher than in the front seats, only a few percent. Considering that plane crashes are rare (once per million flights), this difference can be neglected.
More important are the advantages of the front seat: quick landing and disembarkation, lower noise level and the view from the porthole, which is not obscured by the wing and the engines.
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WHY doesn't food burn in oil?
When frying in a pan without oil, the food only gets hot at the bottom and the top is not heated, being completely soggy. The oil gives off heat from the lower layers to the upper ones.
The boiling point of oil gives the crust on the food, but you can't get it with cooking, water interferes in the process, it adjusts to its boiling point, which is lower than that of oil.
When frying in a pan without oil, the food only gets hot at the bottom and the top is not heated, being completely soggy. The oil gives off heat from the lower layers to the upper ones.
The boiling point of oil gives the crust on the food, but you can't get it with cooking, water interferes in the process, it adjusts to its boiling point, which is lower than that of oil.
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WHY is a dog's nose wet and cold?
Interestingly, in this condition, the dog can smell better. In dogs, mucus covers not only the inside, but also the outside of the sense of smell. This secret is produced by glands in the lining of the nose and serves as a sort of filter through which the animal analyzes smells.
Its moist nose allows it to detect even the slightest fluctuations in the air and their direction. It also has a keen sense of smell that allows it to not only pick up odors, but also to separate them from each other.
Interestingly, in this condition, the dog can smell better. In dogs, mucus covers not only the inside, but also the outside of the sense of smell. This secret is produced by glands in the lining of the nose and serves as a sort of filter through which the animal analyzes smells.
Its moist nose allows it to detect even the slightest fluctuations in the air and their direction. It also has a keen sense of smell that allows it to not only pick up odors, but also to separate them from each other.
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WHY do human eyes move in sync?
The coordinated movement of the eyes allows us to build a three-dimensional image of an object and accurately estimate the distance to it.
➡️ But some sedentary animals (chameleons, seahorses) have eyes that can move independently of one another.
The coordinated movement of the eyes allows us to build a three-dimensional image of an object and accurately estimate the distance to it.
➡️ But some sedentary animals (chameleons, seahorses) have eyes that can move independently of one another.
WHY is soap easier to wash off with warm water?
In warm water, molecules are more mobile and more active in interacting with soap molecules, pulling them off the skin and converting into water-suspended droplets.
In this form, detergents are easily removed from the surface along with pollutants inside these "droplets".
In warm water, molecules are more mobile and more active in interacting with soap molecules, pulling them off the skin and converting into water-suspended droplets.
In this form, detergents are easily removed from the surface along with pollutants inside these "droplets".
WHY does motion sickness occur?
It is caused by a malfunction of the vestibular apparatus, responsible for keeping us firmly on feet.
It reacts to changes in the position of the head and body in space, as well as to acceleration.
When a person's body moves and sways in a car or on a boat, the brain receives conflicting information from the different senses, which causes nausea, dizziness, and headaches.
It is caused by a malfunction of the vestibular apparatus, responsible for keeping us firmly on feet.
It reacts to changes in the position of the head and body in space, as well as to acceleration.
When a person's body moves and sways in a car or on a boat, the brain receives conflicting information from the different senses, which causes nausea, dizziness, and headaches.
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WHY do men and women hear sounds differently?
Women hear high pitched sounds better than men.
They are also better at recognizing changes in tone than men and therefore know exactly when men are lying😏
Men, on the other hand, specialize in wildlife sounds and hear perfectly well where the sound is coming from. If a woman is the first to hear a kitten's meow, it is the man who will indicate where to look for it.
Women hear high pitched sounds better than men.
They are also better at recognizing changes in tone than men and therefore know exactly when men are lying😏
Men, on the other hand, specialize in wildlife sounds and hear perfectly well where the sound is coming from. If a woman is the first to hear a kitten's meow, it is the man who will indicate where to look for it.
WHY are clouds white at night?
A cloud is a collection of water droplets and ice crystals with no color and only partially diffuse light hitting them.
At night, low clouds appear whiter than the sky when the city lights are high.
In contrast, in a dark area, clouds obscure the faint glow of the night sky and appear black.
A cloud is a collection of water droplets and ice crystals with no color and only partially diffuse light hitting them.
At night, low clouds appear whiter than the sky when the city lights are high.
In contrast, in a dark area, clouds obscure the faint glow of the night sky and appear black.
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WHY are there no thunderstorms or lightning in winter?
In order for a thundercloud to form, warm, moist air rises. Humidity increases as the temperature goes up.
All the particles of precipitation: rain, hail, are electrically charged. When they gather in large numbers, this charge increases.
Wet summer air has a greater conductivity of electricity, and the discharge of the potential difference is accompanied by thunder and lightning.
In order for a thundercloud to form, warm, moist air rises. Humidity increases as the temperature goes up.
All the particles of precipitation: rain, hail, are electrically charged. When they gather in large numbers, this charge increases.
Wet summer air has a greater conductivity of electricity, and the discharge of the potential difference is accompanied by thunder and lightning.