WHY don't birds fall off the branches while sleeping?
Most animals relax their muscles during sleep. With birds, it's different.
The tighter the muscles in birds, the stronger and healthier their sleep. During sleep, the muscles are in such a state that the feathered birds cannot straighten their legs. The fingers tightly grasp a twig or a perch and turn into a strong lock, which will open only after waking up.
By the way, some birds sleep standing up. And even in the water. Flamingos and herons like to doze in this way. It is believed that they press up one leg to keep warmth and body temperature. Storks can sleep right during their flight (although they take turns doing it), and the dark tern sleeps in flight over the sea.
Most animals relax their muscles during sleep. With birds, it's different.
The tighter the muscles in birds, the stronger and healthier their sleep. During sleep, the muscles are in such a state that the feathered birds cannot straighten their legs. The fingers tightly grasp a twig or a perch and turn into a strong lock, which will open only after waking up.
By the way, some birds sleep standing up. And even in the water. Flamingos and herons like to doze in this way. It is believed that they press up one leg to keep warmth and body temperature. Storks can sleep right during their flight (although they take turns doing it), and the dark tern sleeps in flight over the sea.
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WHY shouldn't we eat snow?
As some studies indicate, snow is really dirty! Even snow that hasn't yet touched the ground. That's due to the fact that snowflakes absorb car exhaust fumes. Moreover, for the experiments, even the snow that lies far outside the city was taken. Elements of carbon black and dirt were also found there.
From a broader perspective, snow also poses another danger. If you eat too much of it (which sometimes happens when you are thirsty and there is no water nearby), you can easily freeze your lips, lower your body temperature (hypothermia) and even get dehydrated.
As some studies indicate, snow is really dirty! Even snow that hasn't yet touched the ground. That's due to the fact that snowflakes absorb car exhaust fumes. Moreover, for the experiments, even the snow that lies far outside the city was taken. Elements of carbon black and dirt were also found there.
From a broader perspective, snow also poses another danger. If you eat too much of it (which sometimes happens when you are thirsty and there is no water nearby), you can easily freeze your lips, lower your body temperature (hypothermia) and even get dehydrated.
WHY don't penguins fly?
Swimming is great, but flying is an obvious failure. This is due to the fact that their bones lack the familiar lightness of birds and resemble more the structure of humans and other mammals. The wings are also peculiar: they have no wing feathers, do not bend, and look more like a fish fin.
Some scientists still argue that penguins were once able to fly. Yet gradually, they were forced to find food in the water, and the flying function was sidelined.
In nature, as we know, everything you don't take advantage of gradually disappears. That's why you have to regularly strain your brain and train your ability to think!
Swimming is great, but flying is an obvious failure. This is due to the fact that their bones lack the familiar lightness of birds and resemble more the structure of humans and other mammals. The wings are also peculiar: they have no wing feathers, do not bend, and look more like a fish fin.
Some scientists still argue that penguins were once able to fly. Yet gradually, they were forced to find food in the water, and the flying function was sidelined.
In nature, as we know, everything you don't take advantage of gradually disappears. That's why you have to regularly strain your brain and train your ability to think!
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WHY do animals molt?
Generally, molting lasts several times a year and has a specific purpose. In hares, molting is a process of camouflage. As soon as the snow falls, they turn white. And by summer, they prefer to get their gray coats back on to blend in with the soil and trees.
Birds need to molt to attract a mate. During the mating season, the plumage of males turns bright and saturated, but with the formation of the family it dims and loses its appeal.
The molting of snakes is a process of recuperation. Their scales are constantly rubbing against rocks and the skin wears off. One has to take care of getting renewed.
Generally, molting lasts several times a year and has a specific purpose. In hares, molting is a process of camouflage. As soon as the snow falls, they turn white. And by summer, they prefer to get their gray coats back on to blend in with the soil and trees.
Birds need to molt to attract a mate. During the mating season, the plumage of males turns bright and saturated, but with the formation of the family it dims and loses its appeal.
The molting of snakes is a process of recuperation. Their scales are constantly rubbing against rocks and the skin wears off. One has to take care of getting renewed.
WHY would the world cease to exist without bacteria?
Bacteria are not only on your skin, which you clean so diligently, but also inside: in the gullet, stomach, intestines... Each organ is characterized by its own set of bacteria, indispensable for its functioning.
Without them, for instance, the cycle of substances in nature wouldn't be feasible. Some bacteria focus on making nitrogenous fertilizer for plants. And without them, the plant world would fall into disrepair.
Also, bacteria are unique sanitizers. They eliminate dead organisms and keep dead cells from flooding our world.
Bacteria are not only on your skin, which you clean so diligently, but also inside: in the gullet, stomach, intestines... Each organ is characterized by its own set of bacteria, indispensable for its functioning.
Without them, for instance, the cycle of substances in nature wouldn't be feasible. Some bacteria focus on making nitrogenous fertilizer for plants. And without them, the plant world would fall into disrepair.
Also, bacteria are unique sanitizers. They eliminate dead organisms and keep dead cells from flooding our world.
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WHY did the dinosaurs go extinct?
Well, a few attractive and plausible theories are available to guide us:
The famous asteroid that landed in what we now call Mexico. It wiped out some of the living organisms, the survivors got clouds of dust that obscured the sun. The lack of heat and light caused the death of the plants that the herbivorous dinosaurs ate.
There is also the theory of an epidemic. What is known is that it was at the time of the extinction of the dinosaurs that the first infections began to occur on our planet, which posed a serious threat.
Well, a few attractive and plausible theories are available to guide us:
The famous asteroid that landed in what we now call Mexico. It wiped out some of the living organisms, the survivors got clouds of dust that obscured the sun. The lack of heat and light caused the death of the plants that the herbivorous dinosaurs ate.
There is also the theory of an epidemic. What is known is that it was at the time of the extinction of the dinosaurs that the first infections began to occur on our planet, which posed a serious threat.
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WHY shouldn't the air conditioner be switched on when the window is open?
An enormous amount of dust gets into a room from open window and it gets on air conditioner's filter. It is clear that you can clean it afterwards, but all this time you will breathe this unpleasant microscopic particles hardly adding to your health.
An open window increases temperature in a premise, thus a conditioner is forced to double its efforts, and a part of its movements will be idle. In this case, conditioner will be worn out quickly and require repair.
An enormous amount of dust gets into a room from open window and it gets on air conditioner's filter. It is clear that you can clean it afterwards, but all this time you will breathe this unpleasant microscopic particles hardly adding to your health.
An open window increases temperature in a premise, thus a conditioner is forced to double its efforts, and a part of its movements will be idle. In this case, conditioner will be worn out quickly and require repair.
WHY do girls wear pink and boys blue?
Colored clothing began to appear in the nineteenth century, but its division is thought to have emerged only at the end of the century. Major stores recommended a separate color for each sex in order to convince parents to purchase new items for each child.
Moreover, there were cases where the pink color was specifically advised for boys, as it allowed to emphasize the strength and activity of the future man. Girls were encouraged to buy blue clothing, as this color corresponded to their innocence and fragility. Naturally, there were also other recommendations, when pink clothes were attributed to the female sex, and blue — to men.
It is only known that the customary state of affairs did not take hold until the end of the twentieth century.
Colored clothing began to appear in the nineteenth century, but its division is thought to have emerged only at the end of the century. Major stores recommended a separate color for each sex in order to convince parents to purchase new items for each child.
Moreover, there were cases where the pink color was specifically advised for boys, as it allowed to emphasize the strength and activity of the future man. Girls were encouraged to buy blue clothing, as this color corresponded to their innocence and fragility. Naturally, there were also other recommendations, when pink clothes were attributed to the female sex, and blue — to men.
It is only known that the customary state of affairs did not take hold until the end of the twentieth century.
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WHY does silver turn black?
The majority of people assume that the darkening of a piece of silver jewelry is a sign of poor quality or even a sign of fake rather than real metal. But in fact, the darkening of silver is a natural phenomenon due to its chemical properties.
The plaque formation process is promoted by the fact that the sulfur compounds in the air react with the silver to form a dark layer on the surface of any kind of jewelry.
Even silver jewelry that is worn infrequently but stored with other items is subjected to this process. The faster this process occurs, the more sulfur compounds are in the air.
Other factors that can affect the appearance of the jewelry are water and cosmetics.
The majority of people assume that the darkening of a piece of silver jewelry is a sign of poor quality or even a sign of fake rather than real metal. But in fact, the darkening of silver is a natural phenomenon due to its chemical properties.
The plaque formation process is promoted by the fact that the sulfur compounds in the air react with the silver to form a dark layer on the surface of any kind of jewelry.
Even silver jewelry that is worn infrequently but stored with other items is subjected to this process. The faster this process occurs, the more sulfur compounds are in the air.
Other factors that can affect the appearance of the jewelry are water and cosmetics.
WHY are rare animal species disappearing?
Humans do significant damage to the world around them. By developing new territories, they bring predators to the land, harmful to many innocent species. Thus, for example, many marsupials have become extinct. In truth, the marsupial wolf was exterminated by humans themselves.
People are cutting down forests and developing beaches that were wild and favorable to many inhabitants before their arrival. For instance, tapirs are not particularly fond of human companionship, so when humans appear, they go in search of uninhabited areas, which are now becoming fewer and fewer in number.
Poachers who hunt now for the pretty pelts of the ocelot and snow leopard, then for a strong whale whisker, or a huge elephant tusk, then for a rhinoceros horn... There is a belief that rhinoceros horn is a source of strength and beauty.
Humans do significant damage to the world around them. By developing new territories, they bring predators to the land, harmful to many innocent species. Thus, for example, many marsupials have become extinct. In truth, the marsupial wolf was exterminated by humans themselves.
People are cutting down forests and developing beaches that were wild and favorable to many inhabitants before their arrival. For instance, tapirs are not particularly fond of human companionship, so when humans appear, they go in search of uninhabited areas, which are now becoming fewer and fewer in number.
Poachers who hunt now for the pretty pelts of the ocelot and snow leopard, then for a strong whale whisker, or a huge elephant tusk, then for a rhinoceros horn... There is a belief that rhinoceros horn is a source of strength and beauty.
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WHY are some animals born blind?
Cats and dogs give birth to several babies at once that are not fully matured. If nature allowed the babies to mature in their mother's belly, it would become so enormous that the poor mother might die.
Interestingly, rabbits and bunnies, despite their many similarities, are born completely different. Rabbits are not only born blind, but also deaf. They also have no fur on them. Naturally, at first they are completely dependent on their mother.
Things go a little bit overboard with rabbits: the female pregnancy lasts a few weeks longer, but in a couple of days the cubs are not only able to get away from their mother, but also try some solid, "grown up" food.
Cats and dogs give birth to several babies at once that are not fully matured. If nature allowed the babies to mature in their mother's belly, it would become so enormous that the poor mother might die.
Interestingly, rabbits and bunnies, despite their many similarities, are born completely different. Rabbits are not only born blind, but also deaf. They also have no fur on them. Naturally, at first they are completely dependent on their mother.
Things go a little bit overboard with rabbits: the female pregnancy lasts a few weeks longer, but in a couple of days the cubs are not only able to get away from their mother, but also try some solid, "grown up" food.
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WHY does the caterpillar turn into a butterfly?
Once it senses the right moment, the caterpillar attaches itself to a leaf by hanging on a special silk thread. With this very thread it wraps itself to form a strong cocoon.
The life of butterflies is not long: some of them live only a few hours, during which they must find a suitable partner and lay eggs. Many butterflies do not even have a mouth opening, because their transformation from a caterpillar has only one goal: to ensure the life of their offspring.
The moth lays its eggs in a certain place. As a rule, it is the inner side of the leaf. This protects the fragile eggs and also provides food for the newborn caterpillars.
Once it senses the right moment, the caterpillar attaches itself to a leaf by hanging on a special silk thread. With this very thread it wraps itself to form a strong cocoon.
The life of butterflies is not long: some of them live only a few hours, during which they must find a suitable partner and lay eggs. Many butterflies do not even have a mouth opening, because their transformation from a caterpillar has only one goal: to ensure the life of their offspring.
The moth lays its eggs in a certain place. As a rule, it is the inner side of the leaf. This protects the fragile eggs and also provides food for the newborn caterpillars.
WHY do people relish quotes?
We post them on our social media pages, use them as statuses in numerous messengers, and simply repost them. And what we like, we instantly tell our friends and acquaintances. They teach us how to live correctly, show us how to act in this or that situation.
Quotes are good motivators. Some phrase can activate our resources, help to overcome obstacles and achieve the goal. You probably already know about the existence of magnets and bookmarks with quotes, which we are offered in stores. Sometimes it's enough to hang such a thing in sight to find the power to fundamentally change your life.
We post them on our social media pages, use them as statuses in numerous messengers, and simply repost them. And what we like, we instantly tell our friends and acquaintances. They teach us how to live correctly, show us how to act in this or that situation.
Quotes are good motivators. Some phrase can activate our resources, help to overcome obstacles and achieve the goal. You probably already know about the existence of magnets and bookmarks with quotes, which we are offered in stores. Sometimes it's enough to hang such a thing in sight to find the power to fundamentally change your life.
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WHY does hair get electrified?
Most of the time, hair gets electrified due to friction on surfaces, such as when wearing a sweater with a tight collar or a snug-fitting turtleneck sweater.
However, we have to deal with this problem more frequently during the colder seasons than in the summer, for instance. There are several reasons for this: the dryness of the hair itself, dry indoor air.
Other causes are sudden temperature changes indoors and outdoors, and synthetic fabrics, which due to their composition promote the formation of static electricity at all times of year.
Most of the time, hair gets electrified due to friction on surfaces, such as when wearing a sweater with a tight collar or a snug-fitting turtleneck sweater.
However, we have to deal with this problem more frequently during the colder seasons than in the summer, for instance. There are several reasons for this: the dryness of the hair itself, dry indoor air.
Other causes are sudden temperature changes indoors and outdoors, and synthetic fabrics, which due to their composition promote the formation of static electricity at all times of year.
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WHY does a person in a high jump not move horizontally, as the planet rotates?
The planet moves while the jumper is standing, then the jumper relocates in space with the speed of rotation of the Earth relative to the observer from the orbit and with zero speed relative to the observer standing nearby.
When a person jumps, the body rushes up relative to the ground, but the motion vector of the body in space due to inertia remains almost the same, just shifts a certain distance due to the applied force of the jumper.
The planet moves while the jumper is standing, then the jumper relocates in space with the speed of rotation of the Earth relative to the observer from the orbit and with zero speed relative to the observer standing nearby.
When a person jumps, the body rushes up relative to the ground, but the motion vector of the body in space due to inertia remains almost the same, just shifts a certain distance due to the applied force of the jumper.
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WHY do paper cups not get wet?
Paper cups, thanks to the special structure of the paper they are made of, isolate the temperature of the drink much better. This way, a cold drink will take longer to heat up, and a hot one will cool down more slowly.
They are covered on the inside with a microscopic layer of polyethylene or other safe, waterproof plastic. That's why every modern paper cup is partly plastic. This layer of polyethylene is so thin that it will not contaminate the environment as common plastic cups do, so there is no need to worry about the preservation of nature.
Paper cups, thanks to the special structure of the paper they are made of, isolate the temperature of the drink much better. This way, a cold drink will take longer to heat up, and a hot one will cool down more slowly.
They are covered on the inside with a microscopic layer of polyethylene or other safe, waterproof plastic. That's why every modern paper cup is partly plastic. This layer of polyethylene is so thin that it will not contaminate the environment as common plastic cups do, so there is no need to worry about the preservation of nature.
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WHY is the number pi called that?
The number pi expresses the ratio of the circumference of a circle to its diameter and is approximately 3.14. It was first denoted by the Greek letter π by the Englishman William Jones in his "Synopsis Palmarorium Matheseos", printed in 1706. He was guided by the fact that the word περιμετρέο, "measuring around," begins with it.
The great mathematician Leonhard Euler (1707-1783), who used it frequently, made this designation widespread. How and when the number itself was discovered is unknown. The fact that the ratio of the length of a circle to its diameter is a constant has been known since time immemorial.
The number pi expresses the ratio of the circumference of a circle to its diameter and is approximately 3.14. It was first denoted by the Greek letter π by the Englishman William Jones in his "Synopsis Palmarorium Matheseos", printed in 1706. He was guided by the fact that the word περιμετρέο, "measuring around," begins with it.
The great mathematician Leonhard Euler (1707-1783), who used it frequently, made this designation widespread. How and when the number itself was discovered is unknown. The fact that the ratio of the length of a circle to its diameter is a constant has been known since time immemorial.
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WHY should children not get addicted to coffee?
Before the age of five, it is not advisable to give coffee to a child. An immature nervous system can react to caffeine by becoming overexcited.
After the age of five, many children have already tried coffee. Nevertheless, coffee even in this mild form is not recommended, as children's nervous system is still not ready for this drink.
At the age of 12-13 teenagers are eager to look especially mature. And coffee for them as another attribute of adulthood. Hormonal change, serious stress on the nervous system — at this age it is better to refrain from coffee.
Before the age of five, it is not advisable to give coffee to a child. An immature nervous system can react to caffeine by becoming overexcited.
After the age of five, many children have already tried coffee. Nevertheless, coffee even in this mild form is not recommended, as children's nervous system is still not ready for this drink.
At the age of 12-13 teenagers are eager to look especially mature. And coffee for them as another attribute of adulthood. Hormonal change, serious stress on the nervous system — at this age it is better to refrain from coffee.
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WHY did Picasso stoke the stove with his paintings?
In 1900, Picasso moves from Spain to Paris, where he spends time learning about the work of the Impressionists. During this period, his life was fraught with many hardships. The artist was so poor that at times he was forced to heat the stove with his own paintings instead of firewood.
The prospect of freezing from the cold seems to have been much worse for the artist than the sacrifice of his art. However, the prey was not in vain, since it is thanks to the difficult circumstances of life in the works of the painter there is a famous "blue period". The palette of these paintings are characterized by blue shades. In the paintings of this period are clearly represented the images of poverty, sadness and melancholy, the themes of old age and death.
The painter depicted the beggar, the blind, alcoholics and prostitutes, trying to show the world human suffering.
In 1900, Picasso moves from Spain to Paris, where he spends time learning about the work of the Impressionists. During this period, his life was fraught with many hardships. The artist was so poor that at times he was forced to heat the stove with his own paintings instead of firewood.
The prospect of freezing from the cold seems to have been much worse for the artist than the sacrifice of his art. However, the prey was not in vain, since it is thanks to the difficult circumstances of life in the works of the painter there is a famous "blue period". The palette of these paintings are characterized by blue shades. In the paintings of this period are clearly represented the images of poverty, sadness and melancholy, the themes of old age and death.
The painter depicted the beggar, the blind, alcoholics and prostitutes, trying to show the world human suffering.
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