WHY do bears hibernate?
Hibernating in a den helps bears survive the hungry winter season.
When a bear hibernates, it barely moves. At the same time, its body temperature drops to 30° C and the functioning of the heart and lungs slows down. Such a state of the body contributes to the economical use of the fat accumulated before hibernation.
The bear does not suck its paw because it wants to eat. It does this to moisten its dry feet and to chew off keratinized and coarsened skin.
Hibernating in a den helps bears survive the hungry winter season.
When a bear hibernates, it barely moves. At the same time, its body temperature drops to 30° C and the functioning of the heart and lungs slows down. Such a state of the body contributes to the economical use of the fat accumulated before hibernation.
The bear does not suck its paw because it wants to eat. It does this to moisten its dry feet and to chew off keratinized and coarsened skin.
WHY cannot we feel the air pressure?
An enormous ocean of air lies above our planet. Air presses on humans with a force of more than 15 tons🤯
Imagine having three trucks on top of you. Yet these "trucks" never crush a human being. The reason is that the "air column" presses on us not only from above, but from all sides evenly.
Besides, we also have air inside us. And that air comes under the same pressure. The pressure of the air from inside balances the pressure on the body from outside. That's why we don't notice the pressure on our body.
An enormous ocean of air lies above our planet. Air presses on humans with a force of more than 15 tons🤯
Imagine having three trucks on top of you. Yet these "trucks" never crush a human being. The reason is that the "air column" presses on us not only from above, but from all sides evenly.
Besides, we also have air inside us. And that air comes under the same pressure. The pressure of the air from inside balances the pressure on the body from outside. That's why we don't notice the pressure on our body.
WHY does fire come in various colors? 🔥
The color of a fire is mainly determined by the temperature of the flame and what chemicals are burned in it.
The high temperature of the flame allows the atoms to jump to a higher energy state for a while.
When the atoms return to their original state, they emit light at a certain wavelength.
The color of a fire is mainly determined by the temperature of the flame and what chemicals are burned in it.
The high temperature of the flame allows the atoms to jump to a higher energy state for a while.
When the atoms return to their original state, they emit light at a certain wavelength.
WHY does a bruise appear and changes its color?
When a bump or bruise occurs, the capillaries are damaged. Blood flows from them into the surrounding soft tissues under the skin. Blood contains plenty of hemoglobin, giving it that bright red color.
White blood cells arrive at the site of the injury. They surround the site of the hemorrhage and begin to destroy the blood cells.
Destruction of hemoglobin produces decomposition products — biliverdin (green bile pigment) and bilirubin (yellow-red bile pigment).
When a bump or bruise occurs, the capillaries are damaged. Blood flows from them into the surrounding soft tissues under the skin. Blood contains plenty of hemoglobin, giving it that bright red color.
White blood cells arrive at the site of the injury. They surround the site of the hemorrhage and begin to destroy the blood cells.
Destruction of hemoglobin produces decomposition products — biliverdin (green bile pigment) and bilirubin (yellow-red bile pigment).
WHY is a rainbow shaped like an arc?
A rainbow is an optical phenomenon, the result of the light rays refracting in water droplets when it rains 🌈
Not everyone is aware that a rainbow is a circle. Its center lies on a straight line that runs from the Sun through the observer. Seeing the optical phenomenon completely to a person standing on the ground is prevented by the horizon.
A rainbow is an optical phenomenon, the result of the light rays refracting in water droplets when it rains 🌈
Not everyone is aware that a rainbow is a circle. Its center lies on a straight line that runs from the Sun through the observer. Seeing the optical phenomenon completely to a person standing on the ground is prevented by the horizon.
🌒WHY do solar eclipses occur?
A solar eclipse always takes place during a new moon.
A solar eclipse is the shadow of the Moon on the Earth's surface about 200 km in diameter. Therefore, a solar eclipse can only be observed in a narrow band in the path of the lunar shadow at one time.
Being in the strip of shadow, a total solar eclipse is visible, in which the Moon completely hides the Sun.
A solar eclipse always takes place during a new moon.
A solar eclipse is the shadow of the Moon on the Earth's surface about 200 km in diameter. Therefore, a solar eclipse can only be observed in a narrow band in the path of the lunar shadow at one time.
Being in the strip of shadow, a total solar eclipse is visible, in which the Moon completely hides the Sun.
WHY do volcanoes erupt?
A volcano erupts due to the degassing of magma.
Magma is a thick mass of molten rock with gases and water vapor. It accumulates in what are called magma pockets, which form as a result of the movement of lithospheric plates. They are most likely to be located along the collision line of the plates.
If liquid magma erupts to the Earth's surface, a volcanic eruption begins. Frequently, a volcanic eruption is accompanied by powerful explosions; these are caused by the degassing of magma and the explosion of combustible gases.
A volcano erupts due to the degassing of magma.
Magma is a thick mass of molten rock with gases and water vapor. It accumulates in what are called magma pockets, which form as a result of the movement of lithospheric plates. They are most likely to be located along the collision line of the plates.
If liquid magma erupts to the Earth's surface, a volcanic eruption begins. Frequently, a volcanic eruption is accompanied by powerful explosions; these are caused by the degassing of magma and the explosion of combustible gases.
WHY does stomach rumble? 🐳
When the stomach is empty, gastric juice and gastric gases along with air move in the stomach cavity and interact with each other, resulting in a rumbling sound.
Why is there no such sound when the stomach is not empty? Cause food dampens it by pressing the contents of the stomach against its walls.
Frequent heavy rumbling in the stomach can be a sign of dysbacteriosis. While the rumbling of an empty stomach can be "soothed" by simply eating, dysbacteriosis must be treated.
When the stomach is empty, gastric juice and gastric gases along with air move in the stomach cavity and interact with each other, resulting in a rumbling sound.
Why is there no such sound when the stomach is not empty? Cause food dampens it by pressing the contents of the stomach against its walls.
Frequent heavy rumbling in the stomach can be a sign of dysbacteriosis. While the rumbling of an empty stomach can be "soothed" by simply eating, dysbacteriosis must be treated.
WHY does a person hiccup?
Hiccups are the result of regular ("pulsating") activity of the diaphragm nerve, which causes the diaphragm to contract in powerful and violent movements.
The bottleneck of the diaphragm is the center of the hiccups. When you eat in a hurry, when quite large pieces of food pass through the esophagus, the vagus nerve is injured: it is pressed and irritated.
The sound that occurs is the result of a sharp closure of the vocal cleft.
Hiccups are the result of regular ("pulsating") activity of the diaphragm nerve, which causes the diaphragm to contract in powerful and violent movements.
The bottleneck of the diaphragm is the center of the hiccups. When you eat in a hurry, when quite large pieces of food pass through the esophagus, the vagus nerve is injured: it is pressed and irritated.
The sound that occurs is the result of a sharp closure of the vocal cleft.
👍2
This media is not supported in your browser
VIEW IN TELEGRAM
WHY do we shiver when cold?
Shivering is the body's defensive response to a drop in body temperature.
When the temperature drops, biochemical reactions slow down, and the lower the temperature, the more likely they are to stop altogether.
The skeletal muscles of any warm-blooded animal, contracting, produce a certain amount of work, which results in the release of heat. Shivering allows us to correlate the expenditure of energy and the heat received.
Shivering is the body's defensive response to a drop in body temperature.
When the temperature drops, biochemical reactions slow down, and the lower the temperature, the more likely they are to stop altogether.
The skeletal muscles of any warm-blooded animal, contracting, produce a certain amount of work, which results in the release of heat. Shivering allows us to correlate the expenditure of energy and the heat received.
👍2
WHY do people turn gray?
Melanocytes, located in the hair follicle, are responsible for hair color. They synthesize hair pigments, and their combination determines hair color. Indeed, melanocytes themselves are formed from stem cells.
As we age, the hair follicles wear down. This is manifested by a decrease in the number of melanocytes in the hair follicles, as well as a decrease in the activity of the remaining melanocytes.
Melanocytes, located in the hair follicle, are responsible for hair color. They synthesize hair pigments, and their combination determines hair color. Indeed, melanocytes themselves are formed from stem cells.
As we age, the hair follicles wear down. This is manifested by a decrease in the number of melanocytes in the hair follicles, as well as a decrease in the activity of the remaining melanocytes.
WHY doesn't a lizard cherish its tail?
The process of tail dropping is completely regulated by the brain, not a reflex. When threatened, the muscles and ligaments in the immediate area contract, tear, and the tail separates.
However, this is stressful for the lizard. Without the tail, it is no longer as fast, may lose the ability to reproduce, runs and climbs poorly due to the lack of a "rudder".
Indeed, most importantly, many lizards tail serves to store fat and nutrients, which means that all their energy is concentrated in the tail. Therefore, after its detachment, the animal may die of exhaustion.
The process of tail dropping is completely regulated by the brain, not a reflex. When threatened, the muscles and ligaments in the immediate area contract, tear, and the tail separates.
However, this is stressful for the lizard. Without the tail, it is no longer as fast, may lose the ability to reproduce, runs and climbs poorly due to the lack of a "rudder".
Indeed, most importantly, many lizards tail serves to store fat and nutrients, which means that all their energy is concentrated in the tail. Therefore, after its detachment, the animal may die of exhaustion.
WHY are Detroit Red Wings hockey fans throwing octopuses on the ice?
It all began in April 1952, when Detroit once again entered the Stanley Cup. In those years, all it took to win the trophy was two four-game winning streaks, meaning eight games.
Brothers Peter and Gerald Cusimano, who owned fish stores, decided to support the Wings in some original way. The idea was put into action on April 15, 1952, at the old Olympia Stadium.
Since then matches in Detroit have been repeatedly interrupted by a rain of gutted clams 🐙
It all began in April 1952, when Detroit once again entered the Stanley Cup. In those years, all it took to win the trophy was two four-game winning streaks, meaning eight games.
Brothers Peter and Gerald Cusimano, who owned fish stores, decided to support the Wings in some original way. The idea was put into action on April 15, 1952, at the old Olympia Stadium.
Since then matches in Detroit have been repeatedly interrupted by a rain of gutted clams 🐙
WHY does the orchestra conductor shake hands with the first violinist in concerts?
He does so primarily for the reason that the first violinist is the orchestra's tuning fork, the realization of the conductor's intent.
Interesting fact: Beethoven, recognizing the talent of Ludwig Spohr, invited him to be first violin in the famous musical ensemble in which he himself conducted. It was a tribute that endures to this day.
He does so primarily for the reason that the first violinist is the orchestra's tuning fork, the realization of the conductor's intent.
Interesting fact: Beethoven, recognizing the talent of Ludwig Spohr, invited him to be first violin in the famous musical ensemble in which he himself conducted. It was a tribute that endures to this day.
WHY are artificial satellites launched?
Artificial satellites are man-made spacecraft launched into earth orbit, and they do a wide variety of work.
There are a great number of such satellites flying around the Earth: communications, navigation, meteo-satellites, reconnaissance, research, biosatellites, astronomical satellites 🛰
For example, it is impossible to imagine the modern world without communications satellites. They help to watch TV programs, make phone calls, and link computers with each other.
Artificial satellites are man-made spacecraft launched into earth orbit, and they do a wide variety of work.
There are a great number of such satellites flying around the Earth: communications, navigation, meteo-satellites, reconnaissance, research, biosatellites, astronomical satellites 🛰
For example, it is impossible to imagine the modern world without communications satellites. They help to watch TV programs, make phone calls, and link computers with each other.
WHY are horses shod?
Horseshoes protect hooves from wear and tear and from the traumatic effects of solid ground.
Horses cope with hard physical work, such as carrying people, dragging loads, and running for time. They also have to constantly run on hard ground and asphalt. All this leads to hoof wear and tear: they wear out faster than they grow back.
Horseshoes protect hooves from wear and tear and from the traumatic effects of solid ground.
Horses cope with hard physical work, such as carrying people, dragging loads, and running for time. They also have to constantly run on hard ground and asphalt. All this leads to hoof wear and tear: they wear out faster than they grow back.
WHY do birds migrate?
For a long time, there was only one explanation for birds' migrations: they are cold in winter and need a change of climate. Yet feathers can do a pretty good job of protecting birds from the cold. For example, a canary capable of surviving the cold up to -45 degrees Celsius if it has enough food.
Now it is believed that birds fly away to warmer areas in winter from the winter lack of food. Birds use up the energy they get from food very quickly, which means they need to eat often and a lot.
So when the ground freezes and food is hard to find, especially for insectivorous birds, many of them head south.
For a long time, there was only one explanation for birds' migrations: they are cold in winter and need a change of climate. Yet feathers can do a pretty good job of protecting birds from the cold. For example, a canary capable of surviving the cold up to -45 degrees Celsius if it has enough food.
Now it is believed that birds fly away to warmer areas in winter from the winter lack of food. Birds use up the energy they get from food very quickly, which means they need to eat often and a lot.
So when the ground freezes and food is hard to find, especially for insectivorous birds, many of them head south.
WHY do bees make honey?
Honey is vital to bee nutrition, especially in the winter.
To make honey, bees collect nectar from flowers. Since nectar contains a lot of water, bees have to work hard to dry it out. Also, bees add enzymes from their own bodies to the honey to turn the nectar into food and keep it from spoiling.
Honey is stored in the honeycomb for maturation. During ripening, the young bees transfer nectar from one cell to another several times, each time adding their own saliva. This honey is used as food by the bees as needed.
Honey is vital to bee nutrition, especially in the winter.
To make honey, bees collect nectar from flowers. Since nectar contains a lot of water, bees have to work hard to dry it out. Also, bees add enzymes from their own bodies to the honey to turn the nectar into food and keep it from spoiling.
Honey is stored in the honeycomb for maturation. During ripening, the young bees transfer nectar from one cell to another several times, each time adding their own saliva. This honey is used as food by the bees as needed.
WHY does a toucan have a big beak?
Despite its impressive size, the beak is not much of a burden for the bird, as it is very light due to the air cavities inside it: its structure resembles that of frozen foam.
Ornithologists agree that the toucan needs its long beak to get berries from the ends of thin twigs, which can't bear the bird's half-kilogram weight.
Despite its impressive size, the beak is not much of a burden for the bird, as it is very light due to the air cavities inside it: its structure resembles that of frozen foam.
Ornithologists agree that the toucan needs its long beak to get berries from the ends of thin twigs, which can't bear the bird's half-kilogram weight.
WHY are lightning rods used?
Lightning is a highly strong electrical spark that travels several kilometers in the sky in a matter of seconds. This spark makes the air hot and causes an explosion.
A single stroke of lightning can incinerate a tree and start a fire. But long ago people thought of a way to protect themselves and their homes from this danger. They invented the lightning rod — a metal rod, one end of which rises above the roofs of houses and the other end of which is connected to the ground with a wire.
Lightning finds the shortest route: it strikes the rod and, without hurting anyone, escapes through the wire into the ground.
Lightning is a highly strong electrical spark that travels several kilometers in the sky in a matter of seconds. This spark makes the air hot and causes an explosion.
A single stroke of lightning can incinerate a tree and start a fire. But long ago people thought of a way to protect themselves and their homes from this danger. They invented the lightning rod — a metal rod, one end of which rises above the roofs of houses and the other end of which is connected to the ground with a wire.
Lightning finds the shortest route: it strikes the rod and, without hurting anyone, escapes through the wire into the ground.
WHY are sea currents affecting the weather?
The World Ocean plays a special role in creating the climate. Huge amounts of water accumulate here. Evaporation, heating and cooling have a permanent effect on cloudiness and winds.
Another important fact to consider is that the water of the oceans and seas is in constant motion: the upper and lower layers mix, strong currents move cold or warm water over vast distances, affecting the nature of the weather.
The World Ocean plays a special role in creating the climate. Huge amounts of water accumulate here. Evaporation, heating and cooling have a permanent effect on cloudiness and winds.
Another important fact to consider is that the water of the oceans and seas is in constant motion: the upper and lower layers mix, strong currents move cold or warm water over vast distances, affecting the nature of the weather.