WHY do we put out fire with water?
Water, sand, foam, and anything else that puts out a fire cuts off the oxygen to it.
The substances thus cover the burning area and stop the chemical process. Besides, water has a high heat capacity and heat of evaporation. It cools the burning material and slows down the release of combustible gases.
Water, sand, foam, and anything else that puts out a fire cuts off the oxygen to it.
The substances thus cover the burning area and stop the chemical process. Besides, water has a high heat capacity and heat of evaporation. It cools the burning material and slows down the release of combustible gases.
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WHY is the temperature on the thermometer set at 42ยฐ C?
Have you ever boiled an egg? After a few minutes of boiling, the protein curdles, becomes dense and white; this process is called denaturation.
๐ At 42ยฐC, the body also starts denaturing (clotting) blood proteins.
Furthermore, at this temperature, metabolic disorders begin in the brain. Such a condition is already incompatible with life, i.e. fatal.
Have you ever boiled an egg? After a few minutes of boiling, the protein curdles, becomes dense and white; this process is called denaturation.
๐ At 42ยฐC, the body also starts denaturing (clotting) blood proteins.
Furthermore, at this temperature, metabolic disorders begin in the brain. Such a condition is already incompatible with life, i.e. fatal.
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WHY don't birds fall when sleeping on a branch?
Humans can fall asleep when their muscles are as relaxed as possible. In birds, it's the other way around.
โFor them, sleep is only possible when they tense the leg muscles that help them sit steadily on the branch.
These muscles are connected to the fingers by long tendons. When a bird sits down, the muscles contract, the tendons tighten, and the fingers clench. During sleep, the bird cannot straighten its legs, so the toes do not release their support.
Humans can fall asleep when their muscles are as relaxed as possible. In birds, it's the other way around.
โFor them, sleep is only possible when they tense the leg muscles that help them sit steadily on the branch.
These muscles are connected to the fingers by long tendons. When a bird sits down, the muscles contract, the tendons tighten, and the fingers clench. During sleep, the bird cannot straighten its legs, so the toes do not release their support.
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WHY do sharks never sleep?
Some species have to swim all the time, otherwise water stops flowing through their gills so they cannot breathe.
Others rest during special periods, but do not fall into an unconscious state.
โNormally, a shark can rest, remaining in place, for no more than an hour. If it fell asleep for a long time, it would die from lack of oxygen.
Some species have to swim all the time, otherwise water stops flowing through their gills so they cannot breathe.
Others rest during special periods, but do not fall into an unconscious state.
โNormally, a shark can rest, remaining in place, for no more than an hour. If it fell asleep for a long time, it would die from lack of oxygen.
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WHY do llamas spit at people?
๐ According to Successful Farming research, these animals can spit up to 3 meters long๐ฑ
They do this most often in a group to establish hierarchy or to tell an unwanted guest to leave.
If a llama spits at a person in the zoo, it means that he annoys it or intrudes on its territory.
So it is better not to stand next to this cute creature at the zoo๐
๐ According to Successful Farming research, these animals can spit up to 3 meters long๐ฑ
They do this most often in a group to establish hierarchy or to tell an unwanted guest to leave.
If a llama spits at a person in the zoo, it means that he annoys it or intrudes on its territory.
So it is better not to stand next to this cute creature at the zoo๐
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WHY don't your eyes freeze in winter?
Our body has a unique thermoregulatory system. When the ambient temperature drops, the blood flow to the eyeballs increases, bringing them additional heat, which prevents them from turning into iceโ
The fluid that moisturizes the eyes contains salts. The salt water keeps your eyes from freezing even in extremely cold temperatures.
Our body has a unique thermoregulatory system. When the ambient temperature drops, the blood flow to the eyeballs increases, bringing them additional heat, which prevents them from turning into iceโ
The fluid that moisturizes the eyes contains salts. The salt water keeps your eyes from freezing even in extremely cold temperatures.
WHY does food seem disgusting after brushing teeth?
Sodium lauryl sulfate is a foaming agent that is added to almost all toothpaste. It weakens the taste buds responsible for perceiving sweet flavors.
The foaming agent also destroys phospholipids, which normally reduce the sensation of bitterness.
Sodium lauryl sulfate is a foaming agent that is added to almost all toothpaste. It weakens the taste buds responsible for perceiving sweet flavors.
The foaming agent also destroys phospholipids, which normally reduce the sensation of bitterness.
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WHY is it easier to swim in salt water than in fresh one?
โSalt is what makes water heavier. And the greater the density (weight) of water, the easier it is to float in.
An object can float in a liquid if its weight is equal to the weight of the water it pushes out (the water is displaced to give room to the object).
You can also look at it from another angle: if you sit in a tub of water, the water level in it rises. If you drain the water that your body has displaced, the weight of it will be equal to the weight of your body.
โSalt is what makes water heavier. And the greater the density (weight) of water, the easier it is to float in.
An object can float in a liquid if its weight is equal to the weight of the water it pushes out (the water is displaced to give room to the object).
You can also look at it from another angle: if you sit in a tub of water, the water level in it rises. If you drain the water that your body has displaced, the weight of it will be equal to the weight of your body.
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WHY don't insects die after falling from a great height?
If we compare the weight of an ant and a human, the difference is several thousand times.
As an example, the free-fall speed of a human is about 50 m/s. And the fall speed of an insect is around 1 m/s.
โThe lower the fall speed, the less damage will be caused. Also, many insects have wings.
If we compare the weight of an ant and a human, the difference is several thousand times.
As an example, the free-fall speed of a human is about 50 m/s. And the fall speed of an insect is around 1 m/s.
โThe lower the fall speed, the less damage will be caused. Also, many insects have wings.
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WHY can't we detect our own body odor?
There are areas of the cerebral cortex responsible for recognizing odors. Information is carried to it by nerves from receptors.
Since our body continuously emits scents, the receptors quickly become accustomed to them. As a result of this malfunction, the nervous system ignores the information it receives.
โ๏ธBut once the smell changes, the nerve endings send a signal to the brain and we perceive a new scent.
There are areas of the cerebral cortex responsible for recognizing odors. Information is carried to it by nerves from receptors.
Since our body continuously emits scents, the receptors quickly become accustomed to them. As a result of this malfunction, the nervous system ignores the information it receives.
โ๏ธBut once the smell changes, the nerve endings send a signal to the brain and we perceive a new scent.
WHY are Chinese inmates forced to play computer games?
Virtual currency is earned by so-called "gold-farmers", who have such games as a regular daily job. The vast majority of them are employed in China, with more than 100,000 total in 2005.
So in many Chinese prisons, bosses and guards force inmates to play online games for illicit profit.
Virtual currency is earned by so-called "gold-farmers", who have such games as a regular daily job. The vast majority of them are employed in China, with more than 100,000 total in 2005.
So in many Chinese prisons, bosses and guards force inmates to play online games for illicit profit.
WHY does Louis Vuitton burn unsold bags?
Louis Vuitton makes some of the most expensive handbags in the world. Remarkably, they never put their goods on sale.
In order to maintain their status as an expensive brand, the company burns all unsold bags so that no one can buy them at a discounted price.
๐ According to statistics, Louis Vuitton is the most counterfeited brand in the world.
Louis Vuitton makes some of the most expensive handbags in the world. Remarkably, they never put their goods on sale.
In order to maintain their status as an expensive brand, the company burns all unsold bags so that no one can buy them at a discounted price.
๐ According to statistics, Louis Vuitton is the most counterfeited brand in the world.
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WHY don't ducks get wet or freeze in winter?
A duck applies and distributes a special fatty grease, which is secreted by the coccygeal gland, all over its body. It keeps them dry.
As for the extra warm fur and subcutaneous fat, it keeps the cold from penetrating the duck's body. That's why ducks are warm in any frost and can take off even after long "water procedures" as their feathers stay dry.
A duck applies and distributes a special fatty grease, which is secreted by the coccygeal gland, all over its body. It keeps them dry.
As for the extra warm fur and subcutaneous fat, it keeps the cold from penetrating the duck's body. That's why ducks are warm in any frost and can take off even after long "water procedures" as their feathers stay dry.
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WHY haven't humans tamed zebras?
As early as the 19th century, colonizers thought of domesticating zebras in Africa to avoid transporting horses to the continent. Zebras are also resistant to diseases carried by the tsetse fly.
Yet unlike horses, which are carefree, zebras are in a constant state of stress, running away and even sometimes fighting savannah predators. Cornered, a zebra can beat a lion to death.
As early as the 19th century, colonizers thought of domesticating zebras in Africa to avoid transporting horses to the continent. Zebras are also resistant to diseases carried by the tsetse fly.
Yet unlike horses, which are carefree, zebras are in a constant state of stress, running away and even sometimes fighting savannah predators. Cornered, a zebra can beat a lion to death.
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WHY do worms crawl out after it rains?
Roughly 50 years ago, biologists believed that earthworms crawl to the surface after it rains to avoid drowning in their own burrows. However, this theory was rejected as they breathe through their skin, and a wet environment is ideal. There are several hypotheses at this point:
โก๏ธFor easy migration: it is easier for them to travel distances by crawling on a wet surface than by creating passages in the soil.
โก๏ธ Escape from the enemy: raindrops hitting the ground are like vibrations from the movement of predators such as moles.
Roughly 50 years ago, biologists believed that earthworms crawl to the surface after it rains to avoid drowning in their own burrows. However, this theory was rejected as they breathe through their skin, and a wet environment is ideal. There are several hypotheses at this point:
โก๏ธFor easy migration: it is easier for them to travel distances by crawling on a wet surface than by creating passages in the soil.
โก๏ธ Escape from the enemy: raindrops hitting the ground are like vibrations from the movement of predators such as moles.
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WHY can't people breathe and swallow at the same time?
The complex structure of the adult vocal apparatus does not allow humans, unlike animals, to breathe and swallow at the same time.
โ๏ธBehind the root of the tongue is the supraglottic cartilage (epiglottis). It closes the entrance to the larynx when a food lump is swallowed, then opens to allow air to pass into the larynx and then through the respiratory tract.
The complex structure of the adult vocal apparatus does not allow humans, unlike animals, to breathe and swallow at the same time.
โ๏ธBehind the root of the tongue is the supraglottic cartilage (epiglottis). It closes the entrance to the larynx when a food lump is swallowed, then opens to allow air to pass into the larynx and then through the respiratory tract.
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WHY do runners get off to a low start?
Before 1887, all athletes started the race from a standing position.
Then, after observing a kangaroo, the American sprinter Sherrill decided to try a new starting position. As for kangaroos, they duck to the ground just before the start.
Despite the protest of the judge and the mockery of the spectators, Sherrill applied the new method and immediately won the race.
Before 1887, all athletes started the race from a standing position.
Then, after observing a kangaroo, the American sprinter Sherrill decided to try a new starting position. As for kangaroos, they duck to the ground just before the start.
Despite the protest of the judge and the mockery of the spectators, Sherrill applied the new method and immediately won the race.
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WHY is it better to breathe through the nose in the cold?
The nasal cavity exhibits a unique ability to raise or lower the temperature of inhaled air. When it is -25 C outside, the air in a person's nasal cavity heats up to +35... +36,6 ะก.
As opposed to the oral cavity, the nasal one heats the air much more effectively. It is like a built-in split system that ensures normal functioning of the lower respiratory tract.
The nasal cavity exhibits a unique ability to raise or lower the temperature of inhaled air. When it is -25 C outside, the air in a person's nasal cavity heats up to +35... +36,6 ะก.
As opposed to the oral cavity, the nasal one heats the air much more effectively. It is like a built-in split system that ensures normal functioning of the lower respiratory tract.
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WHY is a zebra black with a white stripe and not vice versa?๐
Many people are convinced that a zebra is a white horse in a black stripe cause zebras have white bellies.
Scientists posed this tricky question and found out that zebras are black with a white stripe even at the embryonic stage, not the other way around.
โBlack is the main pigment, and white stripes are the lack of it.
Many people are convinced that a zebra is a white horse in a black stripe cause zebras have white bellies.
Scientists posed this tricky question and found out that zebras are black with a white stripe even at the embryonic stage, not the other way around.
โBlack is the main pigment, and white stripes are the lack of it.
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WHY are the "black boxes" in airplanes actually red or orange?
A "black box" is a device installed in an airplane to record information about the technical condition of all devices, as well as the actions and conversations of the crew.
Actually, it is not a box, but rather a ball or cylinder. And its color is not black, but red or orange, to make it easier to find in case of an accident.
A "black box" is a device installed in an airplane to record information about the technical condition of all devices, as well as the actions and conversations of the crew.
Actually, it is not a box, but rather a ball or cylinder. And its color is not black, but red or orange, to make it easier to find in case of an accident.