WHY does a boomerang return?
The boomerang's shape and the way it is thrown is such that in flight it is subjected to an aerodynamic force which is directed perpendicular to its trajectory.
Due to this, the boomerang does not fly straight ahead, but, like a curved ball, takes to the side and returns approximately along a circular trajectory.
Unless, of course, it hits its target on the way. But there are also such boomerangs, which fly straight ahead and use aerodynamics to increase the flight range.
The boomerang's shape and the way it is thrown is such that in flight it is subjected to an aerodynamic force which is directed perpendicular to its trajectory.
Due to this, the boomerang does not fly straight ahead, but, like a curved ball, takes to the side and returns approximately along a circular trajectory.
Unless, of course, it hits its target on the way. But there are also such boomerangs, which fly straight ahead and use aerodynamics to increase the flight range.
WHY are dreams so hard to remember?
The conditions of the brain during sleep do not allow the dream to be transferred to long-term memory upon awakening.
In addition, a lack of the hormone noradrenaline, which is responsible for long-term memory, also plays a role.
Another reason could be that neurons from the hippocampus do not work properly during the REM sleep phase, which prevents them from transferring information to other neurons, delivering sleep never stored in memory.
The conditions of the brain during sleep do not allow the dream to be transferred to long-term memory upon awakening.
In addition, a lack of the hormone noradrenaline, which is responsible for long-term memory, also plays a role.
Another reason could be that neurons from the hippocampus do not work properly during the REM sleep phase, which prevents them from transferring information to other neurons, delivering sleep never stored in memory.
🤩1
WHY do dogs drink toilet water?
Dogs are scavengers by nature. It's in their genes and has been for thousands of years.
A dog sees the world differently than a human. A dog's value system and its understanding of right and wrong is radically various from that of humans. For them, drinking from the toilet is not at all disgusting, but rather natural. The logic is simple: if you see a source of cool water, drink it.
The water in the toilet is always cool and clean, unless, of course, the toilet bowl itself is dirty. Cold, fresh water is preferable to room temperature water. In addition, the water we pour for our pets can sit in the bowl for several hours, and bits of food can accumulate there.
Also, the water in a metal or plastic bowl may have a tang of the material, making it less appealing to the pet.
Dogs are scavengers by nature. It's in their genes and has been for thousands of years.
A dog sees the world differently than a human. A dog's value system and its understanding of right and wrong is radically various from that of humans. For them, drinking from the toilet is not at all disgusting, but rather natural. The logic is simple: if you see a source of cool water, drink it.
The water in the toilet is always cool and clean, unless, of course, the toilet bowl itself is dirty. Cold, fresh water is preferable to room temperature water. In addition, the water we pour for our pets can sit in the bowl for several hours, and bits of food can accumulate there.
Also, the water in a metal or plastic bowl may have a tang of the material, making it less appealing to the pet.
😱1
WHY is aluminum called the "winged" metal?
The main property of aluminum is its lightness. It is almost three times lighter than iron, more than three times lighter than copper, and four times lighter than lead. But aluminum itself is a soft metal.
To make aluminum stronger, metals such as zinc, copper, magnesium, and silicon are added to it. They make bridges and power lines and building structures much lighter.
This lightweight metal and its alloys are especially indispensable in the construction of aircraft, rockets and artificial satellites. Its use greatly reduces the weight of modern aircraft.
The main property of aluminum is its lightness. It is almost three times lighter than iron, more than three times lighter than copper, and four times lighter than lead. But aluminum itself is a soft metal.
To make aluminum stronger, metals such as zinc, copper, magnesium, and silicon are added to it. They make bridges and power lines and building structures much lighter.
This lightweight metal and its alloys are especially indispensable in the construction of aircraft, rockets and artificial satellites. Its use greatly reduces the weight of modern aircraft.
👍1
WHY are "Arabic" numerals actually "Indian"?
Nowadays we use numbers that originated in India. They were once the initial letters of corresponding words in the ancient Indian language, Sanskrit (the "Devanagari" alphabet).
Devanagari numbering evolved into the decimal system. As early as the eighth century, this system penetrated into other countries: Indochina, China, Tibet, Iran, Central Asia. In the early ninth century, Muhammad of Khwarazm spread Indian numbering to the Arab countries.
These numbers came to Europe in the XII century and by the XVI century, thanks to its universality, became completely established there. As the "Devanagari" system came to Europeans from the Arabs, they called it "Arabian".
Nowadays we use numbers that originated in India. They were once the initial letters of corresponding words in the ancient Indian language, Sanskrit (the "Devanagari" alphabet).
Devanagari numbering evolved into the decimal system. As early as the eighth century, this system penetrated into other countries: Indochina, China, Tibet, Iran, Central Asia. In the early ninth century, Muhammad of Khwarazm spread Indian numbering to the Arab countries.
These numbers came to Europe in the XII century and by the XVI century, thanks to its universality, became completely established there. As the "Devanagari" system came to Europeans from the Arabs, they called it "Arabian".
❤1
WHY do baby teeth fall out?
One important function of deciduous teeth is that they "point" to the molar teeth where they will erupt. If a baby tooth falls out prematurely, the permanent tooth "loses its bearings" and can grow crooked.
By the age of 6-7, these teeth will begin to erupt. This process is accompanied by the resorption of the roots of the baby teeth. This causes the baby teeth to loosen. When the shortened root can no longer hold the baby tooth in the hole, it falls out.
One important function of deciduous teeth is that they "point" to the molar teeth where they will erupt. If a baby tooth falls out prematurely, the permanent tooth "loses its bearings" and can grow crooked.
By the age of 6-7, these teeth will begin to erupt. This process is accompanied by the resorption of the roots of the baby teeth. This causes the baby teeth to loosen. When the shortened root can no longer hold the baby tooth in the hole, it falls out.
WHY shouldn't unwashed dishes be left overnight?
The thing is that the remains of food, which are certainly present on the dishes, overnight react with each other, begins the process of rotting. All of this combined, of course, leads to an unpleasant smell.
It is vital to realize that in dirty dishes overnight bacteria multiply, and even if you wash it until visually clean, there’s a possibility that some trace elements and germs will remain on the surface.
The thing is that the remains of food, which are certainly present on the dishes, overnight react with each other, begins the process of rotting. All of this combined, of course, leads to an unpleasant smell.
It is vital to realize that in dirty dishes overnight bacteria multiply, and even if you wash it until visually clean, there’s a possibility that some trace elements and germs will remain on the surface.
😁2👍1🔥1
WHY does a person sleepwalk at night?
People suffering from this disorder may "activate" at night during sleep if any irritant or stressful situation arises in the dream.
Under such conditions, people try to implement the actions they need in dreams in the real world. And they manage to do this because the so-called state of sleep paralysis is not in an active stage, which means that a person can get out of bed and perform the simplest actions.
People suffering from this disorder may "activate" at night during sleep if any irritant or stressful situation arises in the dream.
Under such conditions, people try to implement the actions they need in dreams in the real world. And they manage to do this because the so-called state of sleep paralysis is not in an active stage, which means that a person can get out of bed and perform the simplest actions.
🔥2
WHY is the Moon sometimes orange?
The rays of sunlight are known to include all existing colors. The Moon reflects sunlight and redirects it to Earth. But light still needs to break through our atmosphere before it can reach human eyes.
On its way to Earth's surface, sunlight is able to refract gases in the atmosphere, causing us to see the Moon in red, orange, or some other color when we look through a prism of sorts.
The rays of sunlight are known to include all existing colors. The Moon reflects sunlight and redirects it to Earth. But light still needs to break through our atmosphere before it can reach human eyes.
On its way to Earth's surface, sunlight is able to refract gases in the atmosphere, causing us to see the Moon in red, orange, or some other color when we look through a prism of sorts.
WHY was it better before and what are the reasons?
Psychologists call it the duckling syndrome. When a duckling hatches from an egg, the first thing it sees is its mother. But if she is not there, it takes for its mother what is near him.
This is also the case with man. When he encounters a new field of study when he is young, then he begins to think of that object as the best. This is how we always remember our first love, adore old computer toys, watch ancient movies from our childhood, enjoy old things and clothes.
Psychologists call it the duckling syndrome. When a duckling hatches from an egg, the first thing it sees is its mother. But if she is not there, it takes for its mother what is near him.
This is also the case with man. When he encounters a new field of study when he is young, then he begins to think of that object as the best. This is how we always remember our first love, adore old computer toys, watch ancient movies from our childhood, enjoy old things and clothes.
WHY does the Moon always face one side of the Earth?
Many people mistakenly assume that the Moon, unlike the Earth, does not rotate on its axis. This is fundamentally incorrect statement, since the Moon also performs similar rotations.
The thing is that the rotation of the Moon around its axis has such a character of speed, that during the rotation around the Earth, the motion of our natural satellite is synchronized and leads to the fact that the space body is always turned by the same side to the surface of our planet. Overall, we are able to observe about 59 percent of the lunar surface.
Many people mistakenly assume that the Moon, unlike the Earth, does not rotate on its axis. This is fundamentally incorrect statement, since the Moon also performs similar rotations.
The thing is that the rotation of the Moon around its axis has such a character of speed, that during the rotation around the Earth, the motion of our natural satellite is synchronized and leads to the fact that the space body is always turned by the same side to the surface of our planet. Overall, we are able to observe about 59 percent of the lunar surface.
🎉1
WHY do cats sleep on people?
It's all about human body temperature and a cat's affinity for its owner.
There is no doubt that cats are highly fond of sleeping on something warm, and compared to the objects around them, it is the human that radiates the most warmth, which makes it the ideal option for their pet to sleep.
It's all about human body temperature and a cat's affinity for its owner.
There is no doubt that cats are highly fond of sleeping on something warm, and compared to the objects around them, it is the human that radiates the most warmth, which makes it the ideal option for their pet to sleep.
WHY does beer make the belly grow?
The consequences of drinking beer are negative for men. When drinking this heady drink frequently, the content of estrogen (the female hormone) in the male body increases.
It contributes to the accumulation of excess blubber, which results in the formation of the so-called "beer belly".
It also leads to a serious hormonal failure, which spoils the figure and worsens men's health.
The consequences of drinking beer are negative for men. When drinking this heady drink frequently, the content of estrogen (the female hormone) in the male body increases.
It contributes to the accumulation of excess blubber, which results in the formation of the so-called "beer belly".
It also leads to a serious hormonal failure, which spoils the figure and worsens men's health.
👍1
WHY is the swamp gurgling?
If you've ever observed a swamp, you may have noticed that bubbles are constantly rising to the surface. This is marsh gas coming out of the silt.
It is produced by the decomposition of plant debris under the influence of bacteria without access to air.
This gas is colorless and odorless. It is also heavier than air and highly explosive❗️
If you've ever observed a swamp, you may have noticed that bubbles are constantly rising to the surface. This is marsh gas coming out of the silt.
It is produced by the decomposition of plant debris under the influence of bacteria without access to air.
This gas is colorless and odorless. It is also heavier than air and highly explosive❗️
WHY is it hard to breathe in the mountains?
When move away from the earth's surface, the density of air decreases. This is due to the pressure in the upper atmosphere is lower than on the ground.
The lower layers of air are under more pressure than the upper layers.
This means that such thin air contains fewer molecules, including oxygen molecules.
When move away from the earth's surface, the density of air decreases. This is due to the pressure in the upper atmosphere is lower than on the ground.
The lower layers of air are under more pressure than the upper layers.
This means that such thin air contains fewer molecules, including oxygen molecules.
WHY do dogs dig holes?
It is worth noting that dogs were not always pets. And when they were wild animals, digging holes was in their blood.
It is these instincts that pets are periodically reminded of even today, which leads to an irresistible desire to dig a hole.
Oftentimes, dogs dig holes on hot summer days. They remove the top layer of soil in order to get to the cooler one and comfortably settle down there.
It is worth noting that dogs were not always pets. And when they were wild animals, digging holes was in their blood.
It is these instincts that pets are periodically reminded of even today, which leads to an irresistible desire to dig a hole.
Oftentimes, dogs dig holes on hot summer days. They remove the top layer of soil in order to get to the cooler one and comfortably settle down there.
👍2😱1
WHY does the water in a river never run out?
Water in rivers travels along their course all the way to where it flows into other rivers, lakes, seas, or oceans.
Water from seas and oceans evaporates and by condensation in clouds falls as precipitation. This can be not only rain, but also snow or ice.
Rainwater can either flow directly into rivers or into rocks that gradually make their way into rivers.
Water in rivers travels along their course all the way to where it flows into other rivers, lakes, seas, or oceans.
Water from seas and oceans evaporates and by condensation in clouds falls as precipitation. This can be not only rain, but also snow or ice.
Rainwater can either flow directly into rivers or into rocks that gradually make their way into rivers.
👍1