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.
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WHY do girls blink twice as often as guys?
📌 And it's true, there is a long-standing proven fact by scientists that women blink twice as often.
It is based on the fact that women's nervous system is more impulsive than men's, it also affects blinking.
A long look at the opponent is a proof of dominance, while frequent blinking is vice versa. In addition, emotional details play an important role.
📌 And it's true, there is a long-standing proven fact by scientists that women blink twice as often.
It is based on the fact that women's nervous system is more impulsive than men's, it also affects blinking.
A long look at the opponent is a proof of dominance, while frequent blinking is vice versa. In addition, emotional details play an important role.
WHY do we drink tequila with salt and lemon?
Before drinking tequila, one should lick the salt, then drink the liquor and snack on a slice of lime.
No other liquor is drunk in this way❗
The reason for this ritual is that the salt and lime change the distinctive taste and smell of tequila and emphasize its original flavor.
Before drinking tequila, one should lick the salt, then drink the liquor and snack on a slice of lime.
No other liquor is drunk in this way❗
The reason for this ritual is that the salt and lime change the distinctive taste and smell of tequila and emphasize its original flavor.
WHY does the wind blow up a fire, but not a match?
Burning wood begins with gasification (evaporation of combustibles by high temperature). In the case of a match, the flame provides the heat. However, the wind takes away the heat, and the match goes out.
A fire is kept burning by coals. The gasification of wood in them occurs in the inner layers when there is a lack of oxygen. The wind replenishes it: the smoldering of coals accelerates, the heat release grows, and the fire is ignited.
Burning wood begins with gasification (evaporation of combustibles by high temperature). In the case of a match, the flame provides the heat. However, the wind takes away the heat, and the match goes out.
A fire is kept burning by coals. The gasification of wood in them occurs in the inner layers when there is a lack of oxygen. The wind replenishes it: the smoldering of coals accelerates, the heat release grows, and the fire is ignited.
WHY do stars twinkle? 🌌
The cause of flickering is the Earth's atmosphere, through which star rays must pass before reaching the eye. Starlight in this case has to penetrate not a homogeneous medium, but gas layers of different temperature, different density, and therefore different refractivity.
Light rays undergo numerous deviations from the straight path, now concentrating, now scattering. Hence the frequent changes in the brightness of the star. And since refraction is accompanied by color scattering, along with fluctuations in brightness, changes in coloration are observed.
The cause of flickering is the Earth's atmosphere, through which star rays must pass before reaching the eye. Starlight in this case has to penetrate not a homogeneous medium, but gas layers of different temperature, different density, and therefore different refractivity.
Light rays undergo numerous deviations from the straight path, now concentrating, now scattering. Hence the frequent changes in the brightness of the star. And since refraction is accompanied by color scattering, along with fluctuations in brightness, changes in coloration are observed.
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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 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).
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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 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.
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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.
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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.