WHY do dogs enjoy chewing on bones?
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They are genetically minded. The ancestors of modern dogs had group hunting as their only opportunity to catch large prey on the plains. Animals with large teeth and strong jaws had a better chance of success in hunting.
For example, it was easier for them to get a dead grip on the leg of a running animal. Beneficial features of the structure were passed on genetically to the next generations.
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Over time, however, dogs lost the need for constant hunting. They also ceased to belong to the class of top predators and can now consume a variety of foods. But the ancestral legacy of sharp teeth and powerful chewing muscles is still with them.
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They are genetically minded. The ancestors of modern dogs had group hunting as their only opportunity to catch large prey on the plains. Animals with large teeth and strong jaws had a better chance of success in hunting.
For example, it was easier for them to get a dead grip on the leg of a running animal. Beneficial features of the structure were passed on genetically to the next generations.
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Over time, however, dogs lost the need for constant hunting. They also ceased to belong to the class of top predators and can now consume a variety of foods. But the ancestral legacy of sharp teeth and powerful chewing muscles is still with them.
WHY do dogs twist in one place before they go to sleep?
Numerous dog owners notice that their pets twist in one place before they go to sleep. Experts say that this strange and slightly amusing ritual is most likely related to the habits of their canine ancestors, who lived in the wild.
Turning around completely in one place is the animal's subconscious way of mashing up grass and leaves to get some sort of nest to sleep in.
The wild ancestors of domestic dogs slept outdoors, so they weren't always warm and safe. If the grass, leaves, or snow were tucked in, a much cozier and more comfy place to sleep would result. Perhaps the dog does a lap before going to sleep to feel safer.
Numerous dog owners notice that their pets twist in one place before they go to sleep. Experts say that this strange and slightly amusing ritual is most likely related to the habits of their canine ancestors, who lived in the wild.
Turning around completely in one place is the animal's subconscious way of mashing up grass and leaves to get some sort of nest to sleep in.
The wild ancestors of domestic dogs slept outdoors, so they weren't always warm and safe. If the grass, leaves, or snow were tucked in, a much cozier and more comfy place to sleep would result. Perhaps the dog does a lap before going to sleep to feel safer.
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WHY does everything seem to be spinning around after rotation?
The oculomotor apparatus and brain visual centers are adjusted so that the image on the retina remains stable during any rotation of the head. Therefore, even while the body is rotating, the surrounding world is perceived as stationary.
Partly, the reason for this is the anticipatory movement of the eyes, and partly because the visual centers correct for speed and direction of movement when processing the signals that come to the brain.
This system cannot readjust instantly after the rotation stops, the compensatory effect lasts for some time, and everything around seems to keep spinning.
The oculomotor apparatus and brain visual centers are adjusted so that the image on the retina remains stable during any rotation of the head. Therefore, even while the body is rotating, the surrounding world is perceived as stationary.
Partly, the reason for this is the anticipatory movement of the eyes, and partly because the visual centers correct for speed and direction of movement when processing the signals that come to the brain.
This system cannot readjust instantly after the rotation stops, the compensatory effect lasts for some time, and everything around seems to keep spinning.
WHY do airplanes not fly in a straight line, but in an arc or in zigzags?
Planes consume a lot of fuel. For example, a Boeing 747 can spend up to 11 tons of fuel in an hour of flight, and during takeoff the consumption increases several times more. It immediately suggests that the shorter the distance, the better and more economical the flight. As you know, the shortest route is a straight line.
Visually, this route appears to be an arc. In fact, the arc is a straight line for an airplane from point A to point B. That is, the trajectory looks curved. This is because the earth is round and the map on the screen is flat. The closer to the poles, the greater the distortion.
But then why the zigzags? It's because of the special rules of flight, which require pilots to stick to certain routes. Routes are constructed based on many factors, such as aircraft type and weather conditions.
Planes consume a lot of fuel. For example, a Boeing 747 can spend up to 11 tons of fuel in an hour of flight, and during takeoff the consumption increases several times more. It immediately suggests that the shorter the distance, the better and more economical the flight. As you know, the shortest route is a straight line.
Visually, this route appears to be an arc. In fact, the arc is a straight line for an airplane from point A to point B. That is, the trajectory looks curved. This is because the earth is round and the map on the screen is flat. The closer to the poles, the greater the distortion.
But then why the zigzags? It's because of the special rules of flight, which require pilots to stick to certain routes. Routes are constructed based on many factors, such as aircraft type and weather conditions.
WHY does the so-called "taarof" play an important role in Iranian culture?
Taarof is a complex set of unwritten rules of ritual politeness in social interaction
We can observe one example of taarof when the host of a house is obliged to offer the guest anything he potentially wants, and the guest, in turn, is obliged to refuse. Each offer must be repeated several times (usually three), and then the parties somehow determine whether the offer and refusal were sincere or not, and act on the situation.
And it is ubiquitous in monetary relations as well: salespeople, cab drivers, and other service providers will refuse to accept payment, but that does not mean that the buyer has the right to really not pay.
Taarof is a complex set of unwritten rules of ritual politeness in social interaction
We can observe one example of taarof when the host of a house is obliged to offer the guest anything he potentially wants, and the guest, in turn, is obliged to refuse. Each offer must be repeated several times (usually three), and then the parties somehow determine whether the offer and refusal were sincere or not, and act on the situation.
And it is ubiquitous in monetary relations as well: salespeople, cab drivers, and other service providers will refuse to accept payment, but that does not mean that the buyer has the right to really not pay.
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WHY does boiled water taste different from raw water?
All water, except distilled water and rainwater, contains salts.
During boiling some of them, especially calcium and magnesium salts, react with other substances dissolved in water and turn into an insoluble sediment (scale).
The taste of the liquid also alters due to changes in the composition of the trace contaminants.
All water, except distilled water and rainwater, contains salts.
During boiling some of them, especially calcium and magnesium salts, react with other substances dissolved in water and turn into an insoluble sediment (scale).
The taste of the liquid also alters due to changes in the composition of the trace contaminants.
WHY do people in Japan suffer discrimination because of blood type?
The Japanese pay a great deal of attention to a person's blood type, believing that it determines one's character.
The first blood type is associated with determination and self-confidence, the second - with reliability and self-confidence, the third - with intelligence and ambition, and the fourth - with poise, rationality and demandingness.
For many Japanese, blood type is one of the criteria for choosing a dating partner, and for employers it can be an additional factor in approving or rejecting an applicant.
The Japanese pay a great deal of attention to a person's blood type, believing that it determines one's character.
The first blood type is associated with determination and self-confidence, the second - with reliability and self-confidence, the third - with intelligence and ambition, and the fourth - with poise, rationality and demandingness.
For many Japanese, blood type is one of the criteria for choosing a dating partner, and for employers it can be an additional factor in approving or rejecting an applicant.
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WHY does a meteorite leave a trail of fire?
A meteorite is a cold stone that leaves a trail of fire as it enters the atmosphere. Except that it is not caused by internal heat, but by rubbing against the air and releasing energy that heats it up.
Nevertheless, some movies show meteorites as heat sources, which is fundamentally wrong.
A meteorite is a cold stone that leaves a trail of fire as it enters the atmosphere. Except that it is not caused by internal heat, but by rubbing against the air and releasing energy that heats it up.
Nevertheless, some movies show meteorites as heat sources, which is fundamentally wrong.
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WHY do skaters pull tights on skates?
First, it visually lengthens the legs. Yeah, still, there is a place for aesthetics here. So it's not a myth.
Secondly, the tights hide the damage on the skates. Shoes are the skater's workhorses, so they get badly scratched and battered over the season. To hide the shabby look, some people touch them up, and others pull tights over them.
Many skaters wear socks, sometimes even terry socks, to create some sort of comfort inside the shoe. The tights inside the shoe will slip, and if you put them on top, they can cover those very socks.
First, it visually lengthens the legs. Yeah, still, there is a place for aesthetics here. So it's not a myth.
Secondly, the tights hide the damage on the skates. Shoes are the skater's workhorses, so they get badly scratched and battered over the season. To hide the shabby look, some people touch them up, and others pull tights over them.
Many skaters wear socks, sometimes even terry socks, to create some sort of comfort inside the shoe. The tights inside the shoe will slip, and if you put them on top, they can cover those very socks.
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WHY a bad scare can make you stutter?
In fact, fright can really be the trigger for the start of the disease. But stuttering can also be congenital.
There are several main causes of stuttering in children, which can be divided into congenital and acquired:
- Heredity.
- Infection suffered by the baby in utero.
- Prematurity, premature birth.
- Severe fright experienced by the baby.
- A big and important event in the child's life (this can be both grief and joy).
- Unfavorable situation in the family.
- Mom and dad's speech peculiarities. If one of the parents stutters, the child may simply imitate the parent, but he or she will not actually stutter.
But doctors agree that stress, at an age when speech is just forming, is more often to blame.
In fact, fright can really be the trigger for the start of the disease. But stuttering can also be congenital.
There are several main causes of stuttering in children, which can be divided into congenital and acquired:
- Heredity.
- Infection suffered by the baby in utero.
- Prematurity, premature birth.
- Severe fright experienced by the baby.
- A big and important event in the child's life (this can be both grief and joy).
- Unfavorable situation in the family.
- Mom and dad's speech peculiarities. If one of the parents stutters, the child may simply imitate the parent, but he or she will not actually stutter.
But doctors agree that stress, at an age when speech is just forming, is more often to blame.
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WHY do kids' teeth grow crooked?
Several reasons may cause a child's teeth to grow crooked:
Foods consumed.
During this period, a baby eats mostly soft foods. If the chewing apparatus doesn't get enough exercise to develop, the maxillofacial bones, lower and upper teeth may grow crooked.
Genetic factors.
Unbalanced nutrition during pregnancy or while breastfeeding.
Lack of minerals or other nutrients in the diet.
Bad habits.
Finger or nipple sucking may also lead to crooked tooth growth.
Several reasons may cause a child's teeth to grow crooked:
Foods consumed.
During this period, a baby eats mostly soft foods. If the chewing apparatus doesn't get enough exercise to develop, the maxillofacial bones, lower and upper teeth may grow crooked.
Genetic factors.
Unbalanced nutrition during pregnancy or while breastfeeding.
Lack of minerals or other nutrients in the diet.
Bad habits.
Finger or nipple sucking may also lead to crooked tooth growth.
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WHY can poor weather affect your Internet connection?
Rain can cause physical damage to cables, especially where telecommunications networks are of old infrastructure. Although most people are already connected to broadband, some parts of the network may run on old telephone lines that are vulnerable to damage.
Most Internet cables lie underground. In the event of a flood, water can get into the cables or their connectors. This can significantly reduce speeds or even block it completely, reducing bandwidth or causing short circuits. But it can affect more than just home communications. Wireless networks outside homes or buildings can be affected by rainfall: water droplets can partially absorb the signal, causing the coverage area to drop.
Even when the rain stops, the effect can still be felt. High humidity, which remains in the air for a long time, can slow down Internet connections.
Rain can cause physical damage to cables, especially where telecommunications networks are of old infrastructure. Although most people are already connected to broadband, some parts of the network may run on old telephone lines that are vulnerable to damage.
Most Internet cables lie underground. In the event of a flood, water can get into the cables or their connectors. This can significantly reduce speeds or even block it completely, reducing bandwidth or causing short circuits. But it can affect more than just home communications. Wireless networks outside homes or buildings can be affected by rainfall: water droplets can partially absorb the signal, causing the coverage area to drop.
Even when the rain stops, the effect can still be felt. High humidity, which remains in the air for a long time, can slow down Internet connections.
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Why do runners start from a low start?
Before 1887, all runners stood at the start at full height, waiting for the command to start running. The low start was invented by Sherrill, an American sprinter, after observing kangaroos ducking to the ground before starting. When he used the new method despite the protest of the judge and the mockery of spectators, he immediately won the race.
So, don't be afraid to do something new, even if others don't like it!
Before 1887, all runners stood at the start at full height, waiting for the command to start running. The low start was invented by Sherrill, an American sprinter, after observing kangaroos ducking to the ground before starting. When he used the new method despite the protest of the judge and the mockery of spectators, he immediately won the race.
So, don't be afraid to do something new, even if others don't like it!
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WHY is filtered beer not the same as unfiltered beer?
Unfiltered beer differs from conventional beer as it is not pasteurized. For this reason, unfiltered beer retains more nutrients, but has a shorter shelf life.
Also, as the name suggests, unfiltered beer undergoes fewer filtration steps - it retains yeast residue and remains cloudy.
Unfiltered beer differs from conventional beer as it is not pasteurized. For this reason, unfiltered beer retains more nutrients, but has a shorter shelf life.
Also, as the name suggests, unfiltered beer undergoes fewer filtration steps - it retains yeast residue and remains cloudy.
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WHY does the wood in the fire crackle?
In simple terms, the combustion process consists of two stages: pyrolysis of wood and combustion of its products. Pyrolysis is the decomposition of complex organics at temperatures up to 450°C. Approximately one quarter of the products are released immediately in the form of gases: carbon dioxide, hydrogen, methane and carbon monoxide. Another half of the wood mass combusts to form a liquid consisting of water and various organics.
The rest of the mass forms charcoal, which is 80-90% carbon. It is highly porous and smolders by interacting with the oxygen that enters its pores. The resulting gases accumulate between the layers of wood and tear them apart with a loud crackling sound.
The wood also crackles constantly, as it shrinks from the heat and deforms, causing the brittle charcoal that formed on the logs during pyrolysis to collapse.
In simple terms, the combustion process consists of two stages: pyrolysis of wood and combustion of its products. Pyrolysis is the decomposition of complex organics at temperatures up to 450°C. Approximately one quarter of the products are released immediately in the form of gases: carbon dioxide, hydrogen, methane and carbon monoxide. Another half of the wood mass combusts to form a liquid consisting of water and various organics.
The rest of the mass forms charcoal, which is 80-90% carbon. It is highly porous and smolders by interacting with the oxygen that enters its pores. The resulting gases accumulate between the layers of wood and tear them apart with a loud crackling sound.
The wood also crackles constantly, as it shrinks from the heat and deforms, causing the brittle charcoal that formed on the logs during pyrolysis to collapse.
WHY do moths eat clothes?
Perhaps, you may be surprised that those flying moths you chase all over the house with a newspaper in your hands simply can't eat.
Yep, yes, an adult moth has absolutely no appetite because of the absence of mouthparts, but its larvae have an excellent appetite, which hatch from the eggs laid in the clothes.
As soon as the larvae are born, they need nutrients of natural origin, such as protein, which is found in abundance in clothing made of natural raw materials. The hungry caterpillars pounce on fabrics of animal origin and eat lint after lint, leaving holes in them in the end.
Well, at least you can rejoice that your pestered clothes are actually made of natural wool.
Perhaps, you may be surprised that those flying moths you chase all over the house with a newspaper in your hands simply can't eat.
Yep, yes, an adult moth has absolutely no appetite because of the absence of mouthparts, but its larvae have an excellent appetite, which hatch from the eggs laid in the clothes.
As soon as the larvae are born, they need nutrients of natural origin, such as protein, which is found in abundance in clothing made of natural raw materials. The hungry caterpillars pounce on fabrics of animal origin and eat lint after lint, leaving holes in them in the end.
Well, at least you can rejoice that your pestered clothes are actually made of natural wool.
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. His life during this period was fraught with many difficulties. 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 sacrifice was not in vain, because 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 artist depicted the poor, 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. His life during this period was fraught with many difficulties. 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 sacrifice was not in vain, because 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 artist depicted the poor, the blind, alcoholics and prostitutes, trying to show the world human suffering
WHY shouldn't we drink yesterday's tea?
If the drink is left outdoors for several hours, bacteria and harmful compounds begin to form when exposed to oxygen.
On the surface of the tea, they look like a thick dark film, which leaves a stain on the mug.
By the way, the most destructive effect of these substances is on the organs of the gastrointestinal tract, mainly the liver.
If the drink is left outdoors for several hours, bacteria and harmful compounds begin to form when exposed to oxygen.
On the surface of the tea, they look like a thick dark film, which leaves a stain on the mug.
By the way, the most destructive effect of these substances is on the organs of the gastrointestinal tract, mainly the liver.
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WHY doesn't food burn on oil?
Oil prevents overheating. Food does not conduct heat well. When frying in a "bare" pan, the bottom layer of the food gets so hot that it can char, while the top of the piece stays raw. The oil transfers the heat from the lower layers to the upper ones.
The main thing is that it, like any liquid, cannot get warmer than its boiling point since the incoming new heat is carried away with the vapor. The boiling temperature of oil is sufficient to form a crispy crust on food.
Cooking and braising do not produce crusts: in these cases, water, which has a relatively low boiling point, plays the role of a stabilizer.
Oil prevents overheating. Food does not conduct heat well. When frying in a "bare" pan, the bottom layer of the food gets so hot that it can char, while the top of the piece stays raw. The oil transfers the heat from the lower layers to the upper ones.
The main thing is that it, like any liquid, cannot get warmer than its boiling point since the incoming new heat is carried away with the vapor. The boiling temperature of oil is sufficient to form a crispy crust on food.
Cooking and braising do not produce crusts: in these cases, water, which has a relatively low boiling point, plays the role of a stabilizer.
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WHY does each flower have a different scent?
To attract the right insects.
Almost all fragrant flowers are pollinated by insects. Plants benefit from pollinators visiting one flower and flying to another one.
Then the flowers will get pollen of their own kind, not someone else's. To this end, flowers have features that help insects recognize them: shape, coloration, and, of course, smell. It can include substances that are attractive to the "right" pollinators.
To attract the right insects.
Almost all fragrant flowers are pollinated by insects. Plants benefit from pollinators visiting one flower and flying to another one.
Then the flowers will get pollen of their own kind, not someone else's. To this end, flowers have features that help insects recognize them: shape, coloration, and, of course, smell. It can include substances that are attractive to the "right" pollinators.
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WHY can't you pull the pin out of a grenade with your teeth, like in the movies?
The fact is that the grenade is a dangerous weapon that has a large kill radius when it explodes. To prevent it from going off accidentally, the pin mechanism is made very tight. You can't just pull it out like that.
Even if you can do it with your teeth, the "hero" will then eat only porridge and ground fruit - he will not be able to chew.
The fact is that the grenade is a dangerous weapon that has a large kill radius when it explodes. To prevent it from going off accidentally, the pin mechanism is made very tight. You can't just pull it out like that.
Even if you can do it with your teeth, the "hero" will then eat only porridge and ground fruit - he will not be able to chew.
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