WHY does hair burn out in the sun?
Hair consists of multiple substances and microelements, including melanin, a natural pigment responsible for the dark shade of hair as well as skin and retina.
Yet melanin has its "weak side": when exposed to the sun, it begins to disintegrate, but only if it is part of the hair, which subsequently turns lighter – burn out.
On the contrary, our skin, exposed to the UV rays, produces more melanin, since the body's defense mechanism is activated.
Hair consists of multiple substances and microelements, including melanin, a natural pigment responsible for the dark shade of hair as well as skin and retina.
Yet melanin has its "weak side": when exposed to the sun, it begins to disintegrate, but only if it is part of the hair, which subsequently turns lighter – burn out.
On the contrary, our skin, exposed to the UV rays, produces more melanin, since the body's defense mechanism is activated.
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WHY do leopards hide their prey in a tree?
Despite their strength, speed and ferocity, leopards have to protect their prey from many savanna creatures.
Lions, hyenas, hyena dogs and other predators are likely to be among the eaters of prey. Thus, leopards conceal their prey in a tree. It literally climbs to such a height with the carcass in its teeth.
At first glance it may seem strange that the leopard is afraid of anyone. However, it is worth considering that this predator does not live in a pack.
Despite their strength, speed and ferocity, leopards have to protect their prey from many savanna creatures.
Lions, hyenas, hyena dogs and other predators are likely to be among the eaters of prey. Thus, leopards conceal their prey in a tree. It literally climbs to such a height with the carcass in its teeth.
At first glance it may seem strange that the leopard is afraid of anyone. However, it is worth considering that this predator does not live in a pack.
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WHY is the woodpecker called the forest doctor?
The woodpecker is able to detect under the bark of which tree pests are hiding.
Once the woodpecker figures out which tree is inhabited by insects, it immediately starts its work. It chisels the tree until there is a hole in it, through which it can extract the pests.
Also, the woodpecker helps other animals by pecking nests in trees, thereby "donating" housing to other birds.
The woodpecker is able to detect under the bark of which tree pests are hiding.
Once the woodpecker figures out which tree is inhabited by insects, it immediately starts its work. It chisels the tree until there is a hole in it, through which it can extract the pests.
Also, the woodpecker helps other animals by pecking nests in trees, thereby "donating" housing to other birds.
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WHY is the Sun called a star and not a planet?
The surface temperature of the Sun is thousands of times that of the Earth and many other planets in our Solar System, indicating that it is a star.
The planets feature a chemical composition whereby they are formed not only of light particles, but also of solid elements. Stars, in turn, are mostly formed from light particles, just like the Sun itself.
On the surface of the Sun, all sorts of nuclear reactions are constantly taking place that are not typical of planets in such quantity and scale.
The surface temperature of the Sun is thousands of times that of the Earth and many other planets in our Solar System, indicating that it is a star.
The planets feature a chemical composition whereby they are formed not only of light particles, but also of solid elements. Stars, in turn, are mostly formed from light particles, just like the Sun itself.
On the surface of the Sun, all sorts of nuclear reactions are constantly taking place that are not typical of planets in such quantity and scale.
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WHY shouldn't we store gasoline in plastic containers?
Many people who have heard of this unspoken rule believe that gasoline should not be stored in plastic containers since it may corrode the walls. However, that's not the case.
Gasoline cannot be stored in plastic as it produces gasoline vapors.
And the plastic itself is much more susceptible to becoming electrified than metal canisters.
That is why if filling plastic containers with gasoline, you run the risk of ending up with an explosion.
Many people who have heard of this unspoken rule believe that gasoline should not be stored in plastic containers since it may corrode the walls. However, that's not the case.
Gasoline cannot be stored in plastic as it produces gasoline vapors.
And the plastic itself is much more susceptible to becoming electrified than metal canisters.
That is why if filling plastic containers with gasoline, you run the risk of ending up with an explosion.
WHY shouldn't driving through puddles at speed?
When hitting water, part of the water does not have time to squeeze out from under the wheel, creating a thin layer of water between the tire and the road surface. The car is not in contact with the asphalt and starts sliding like on ice.
A special danger is water getting on brake pads. The brakes in this case do not work as quickly as required.
Bricks, stones, boards with nails may be on the road in muddy water. Open sewer manholes or open storm drains pose a particular hazard.
When hitting water, part of the water does not have time to squeeze out from under the wheel, creating a thin layer of water between the tire and the road surface. The car is not in contact with the asphalt and starts sliding like on ice.
A special danger is water getting on brake pads. The brakes in this case do not work as quickly as required.
Bricks, stones, boards with nails may be on the road in muddy water. Open sewer manholes or open storm drains pose a particular hazard.
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WHY is it tricky to get the bulb out of one's mouth?
The bulb resembles a pear, and its shape is pretty streamlined. Placing such an object in your mouth is not a big problem. After all, the muscles of the mouth are initially relaxed, so the light bulb enters the mouth quite easily.
Once the light bulb is inside, though, the oral cavity muscles immediately tense and tighten around the illuminating object. And then on an instinctive level the jaw closes, in addition, the teeth significantly interfere.
The bulb resembles a pear, and its shape is pretty streamlined. Placing such an object in your mouth is not a big problem. After all, the muscles of the mouth are initially relaxed, so the light bulb enters the mouth quite easily.
Once the light bulb is inside, though, the oral cavity muscles immediately tense and tighten around the illuminating object. And then on an instinctive level the jaw closes, in addition, the teeth significantly interfere.
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WHY did Catholic monks shave their tops?
Monks began shaving their tonsils in the 7th century, prior to that, only hermits underwent the procedure. Shaving the head was a way of renewing one's energy, suppressing one's ego and getting rid of attachments and destructive passions.
By getting rid of hair, the monk was believed to be cleansed from worldly things, from redundant thoughts, and to be more receptive to the sublime. Perhaps in the Middle Ages, removing a large part of the hair on the head also had a second meaning – hygienic.
Monks began shaving their tonsils in the 7th century, prior to that, only hermits underwent the procedure. Shaving the head was a way of renewing one's energy, suppressing one's ego and getting rid of attachments and destructive passions.
By getting rid of hair, the monk was believed to be cleansed from worldly things, from redundant thoughts, and to be more receptive to the sublime. Perhaps in the Middle Ages, removing a large part of the hair on the head also had a second meaning – hygienic.
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WHY do knees crunch?
Cartilage tissue lies between the two bones, reducing the friction created by walking between the bone tissue, but gradually the cartilage tissue loses its protective properties and the friction cannot be avoided.
Crunching can occur when carrying heavy loads, where cartilage tissue deforms from the increased load. Great stress on the knee comes from awkward shoes with a high heel, so at times you have to make a choice between healthy shoes with a small heel, or a spectacular one with a big rise.
Cartilage tissue lies between the two bones, reducing the friction created by walking between the bone tissue, but gradually the cartilage tissue loses its protective properties and the friction cannot be avoided.
Crunching can occur when carrying heavy loads, where cartilage tissue deforms from the increased load. Great stress on the knee comes from awkward shoes with a high heel, so at times you have to make a choice between healthy shoes with a small heel, or a spectacular one with a big rise.
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WHY are sharks afraid of dolphins?
Sharks are solitary predators. Only rarely do they gather in small groups, and even only during the mating season, then immediately parted.
Dolphins travel the ocean in close groups, strongly supporting family ties. They hunt and defend together.
If a dolphin notices a molested shark, the pack surrounds it and beats its body with a powerful beak. And the dolphin acts with a surge and deliberately marks the most vulnerable place – the gill slits, which is similar to the blow to the solar plexus in humans.
Sharks are solitary predators. Only rarely do they gather in small groups, and even only during the mating season, then immediately parted.
Dolphins travel the ocean in close groups, strongly supporting family ties. They hunt and defend together.
If a dolphin notices a molested shark, the pack surrounds it and beats its body with a powerful beak. And the dolphin acts with a surge and deliberately marks the most vulnerable place – the gill slits, which is similar to the blow to the solar plexus in humans.
WHY is there flickering in our eyes?
There are many causes of flickering in front of the eyes. Almost all of them are related to the failure of the CNS. Pathology is accompanied by poor circulation, which leads to high blood pressure and causes problems in the work of internal organs.
Most often, glare is caused by a malfunction in blood circulation and an increase in intracranial pressure. In this case, the patient observes dots of black and white in front of the eyes. Flicker can also cause the blood vessels of the visual apparatus to overflow.
There are many causes of flickering in front of the eyes. Almost all of them are related to the failure of the CNS. Pathology is accompanied by poor circulation, which leads to high blood pressure and causes problems in the work of internal organs.
Most often, glare is caused by a malfunction in blood circulation and an increase in intracranial pressure. In this case, the patient observes dots of black and white in front of the eyes. Flicker can also cause the blood vessels of the visual apparatus to overflow.
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WHY do people snore in their sleep?
All muscles relax during sleep. If the lumen of the pharynx was originally narrowed, then the relaxed walls of the upper airways, sagging, touch each other.
When breathing in and out, air passes forcefully through the narrowed and partially blocked soft tissues of the pharyngeal canal. The walls of the pharynx begin to vibrate and hit each other, causing snoring.
All muscles relax during sleep. If the lumen of the pharynx was originally narrowed, then the relaxed walls of the upper airways, sagging, touch each other.
When breathing in and out, air passes forcefully through the narrowed and partially blocked soft tissues of the pharyngeal canal. The walls of the pharynx begin to vibrate and hit each other, causing snoring.
WHY do the windows inside the car freeze?
Windshield icing is caused by the fact that the glazing is always warm when the engine is on and the air conditioning system is running. After the engine is turned off, the windows begin to cool.
Since the windshield is tilted, the cooling process is faster than the rest of the glazing. As a result, the moisture vapor that is present inside the cabin turns into an icy crust, and the windshield frosts up from the inside first.
Windshield icing is caused by the fact that the glazing is always warm when the engine is on and the air conditioning system is running. After the engine is turned off, the windows begin to cool.
Since the windshield is tilted, the cooling process is faster than the rest of the glazing. As a result, the moisture vapor that is present inside the cabin turns into an icy crust, and the windshield frosts up from the inside first.
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WHY do people talk in their sleep?
Sleep talking is a common sleep disorder and, according to some researchers, occurs in 50% of young children. Sleep talking in adults occurs in about 5% of cases.
Dreaming is more common in people who are excitable and have experienced strong impressions, both positive and negative, on the previous day.
Still dreaming and dreaming are different things. A dream may be fantastic, unreal. Dreaming, as a rule, reflects real events experienced by a person.
Sleep talking is a common sleep disorder and, according to some researchers, occurs in 50% of young children. Sleep talking in adults occurs in about 5% of cases.
Dreaming is more common in people who are excitable and have experienced strong impressions, both positive and negative, on the previous day.
Still dreaming and dreaming are different things. A dream may be fantastic, unreal. Dreaming, as a rule, reflects real events experienced by a person.
WHY does the microphone hum?
As a matter of fact, there are many reasons for such an odd phenomenon, here are the main ones.
▪ Nearby there is a source of radio-frequency radiation. In most cases, the phonics begins if there is any electronic device next to it.
▪ Improper setting of the microphone.
▪ Signal level. If you amplify the sound or signal level, this can also cause unpleasant sounds.
As a matter of fact, there are many reasons for such an odd phenomenon, here are the main ones.
▪ Nearby there is a source of radio-frequency radiation. In most cases, the phonics begins if there is any electronic device next to it.
▪ Improper setting of the microphone.
▪ Signal level. If you amplify the sound or signal level, this can also cause unpleasant sounds.
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WHY are there 7 days in a week?
Ancient Babylonian astrologers discovered that there were "wandering" luminaries in the sky called planets.
These bodies were believed to revolve around the Earth in this order: Moon, Mercury, Venus, Sun, Mars, Jupiter, and Saturn. Ancient Babylonian astrologers thought that each hour of the day was under the patronage of a particular planet.
For the convenience of calculations and time planning, ancient astronomers and astrologers invented the Star of the Magi, a kind of seven-pointed "calculator". In this star, the planets are arranged in a circle from the slowest, Saturn, to the fastest, the Moon.
The sequence of week days is calculated clockwise by the rays of the star.
Ancient Babylonian astrologers discovered that there were "wandering" luminaries in the sky called planets.
These bodies were believed to revolve around the Earth in this order: Moon, Mercury, Venus, Sun, Mars, Jupiter, and Saturn. Ancient Babylonian astrologers thought that each hour of the day was under the patronage of a particular planet.
For the convenience of calculations and time planning, ancient astronomers and astrologers invented the Star of the Magi, a kind of seven-pointed "calculator". In this star, the planets are arranged in a circle from the slowest, Saturn, to the fastest, the Moon.
The sequence of week days is calculated clockwise by the rays of the star.
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WHY is there left-hand traffic in England?
Left-hand traffic is thought to have originated in England, and was enshrined in law in 1756.
A special bill ordered carriages, riders and pedestrians to move across the London Bridge only on the left side. The penalty was a pound of silver.
And 20 years later, the British passed the "Road Act", which made left-hand traffic mandatory on all roads in the country.
An ancient English maritime rule played a role in the recognition of the "left" side - ships must enter the harbor on the left side and sail on the right.
Left-hand traffic is thought to have originated in England, and was enshrined in law in 1756.
A special bill ordered carriages, riders and pedestrians to move across the London Bridge only on the left side. The penalty was a pound of silver.
And 20 years later, the British passed the "Road Act", which made left-hand traffic mandatory on all roads in the country.
An ancient English maritime rule played a role in the recognition of the "left" side - ships must enter the harbor on the left side and sail on the right.
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WHY do we have nightmares?
Dreams are a way of processing disturbing impressions and emotions a person has to experience in his or her life.
When a dreamer falls asleep, the psyche layers the bad memories onto a specific context, and thus the fears associated with them are dissipated.
✔️ Frequently, the sources of nightmares lie in work, worries about financial well-being, and major changes in one's life.
Dreams are a way of processing disturbing impressions and emotions a person has to experience in his or her life.
When a dreamer falls asleep, the psyche layers the bad memories onto a specific context, and thus the fears associated with them are dissipated.
✔️ Frequently, the sources of nightmares lie in work, worries about financial well-being, and major changes in one's life.
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WHY does the car electrocute?
When driving, you are unconsciously moving on the seat, which is not made of natural materials.
By the end of the ride, static electricity builds up on your body. After touching the car door, you get a "shock".
To avoid the impact, you can close the car by the glass or the plastic door handle, these are so-called "dielectrics".
When driving, you are unconsciously moving on the seat, which is not made of natural materials.
By the end of the ride, static electricity builds up on your body. After touching the car door, you get a "shock".
To avoid the impact, you can close the car by the glass or the plastic door handle, these are so-called "dielectrics".
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WHY are icebergs called freshwater reservoirs?
Today, the earth's population consumes only about 0.01% of the planet's freshwater supply per year. So where is the rest? 70% of the water is preserved in Antarctic glaciers.
Using icebergs for drinking water cannot be called an idea of our time. Back in 1773, the crew of the famous James Cook collected 15 tons of drinking water from Antarctic icebergs for his ship, The Resolution.
Water consumption in the world has increased sevenfold in the 20th century alone, and there is no stopping it. Pretty soon, even developed nations will lack fresh water. It would then turn out to be economically feasible to extract water from icebergs.
Today, the earth's population consumes only about 0.01% of the planet's freshwater supply per year. So where is the rest? 70% of the water is preserved in Antarctic glaciers.
Using icebergs for drinking water cannot be called an idea of our time. Back in 1773, the crew of the famous James Cook collected 15 tons of drinking water from Antarctic icebergs for his ship, The Resolution.
Water consumption in the world has increased sevenfold in the 20th century alone, and there is no stopping it. Pretty soon, even developed nations will lack fresh water. It would then turn out to be economically feasible to extract water from icebergs.
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