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Why is everything green in night vision devices?
In traditional night vision devices (not thermal imagers), the light entering the lenses is converted into shades of black and white, and only when it hits the phosphor screen, it acquires greenish tones. The green gamut was chosen for two reasons: firstly, the human eye is most susceptible to waves of this particular wavelength, and secondly, it tires the eyes less than others during prolonged exposure.
For the same reason, early monochrome monitors were also green.
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How much is this picture cost?
Go to the channel and find out what NFT is and why some of the pictures are more expensive than your house 🏠
Why is an airplane the safest means of transport?
Statistics say that for every 100 million miles a typical passenger flies in an airplane, there are only 0.003 casualties. For comparison: in the case of commercial buses, this figure is 0.05, that is, about 17 times higher.
Plane crashes occur due to a combination of the rarest circumstances, the possibility of which is minimal.
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Why are onions and garlic natural antibiotics?
As well as artificial antibiotics, onions and garlic have antimicrobial, anti-inflammatory and bactericidal properties. And most importantly, the last property is valid for all types of pathogens. That is why, in terms of the degree of therapeutic effect, antibiotics sold in pharmacy chains cannot compete with them.
These properties are inherent in them due to the high content in them of such substances as phytoncides (volatile ether compounds), flavonoids and allicin. Also, their bulbs contain a wide range of vitamins and minerals.
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Why is The Frying Pan Tower considered the most dangerous hotel in the world?
This hotel does not have a luxurious spa, a chic restaurant and a pool, but it does have sunsets, a star-studded night sky, and the boundless Atlantic.
This is the only hotel where you can stay for a couple of days in one of the most destructive places in the Atlantic. For which, in fact, The Frying Pan Tower is considered the most dangerous hotel in the world.
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Why is it impossible to increase the height of an adult?
There is a chance to stretch out a couple of centimeters, hanging on the crossbar or swimming for a long time. But this effect is reversible. It is possible to radically and permanently increase height only by lengthening the lower limbs with the help of devices such as the Ilizarov apparatus.
This technology involves artificial fractures or incisions in the bones of the legs, which is painful and immobilizes for a long time.
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Why does an owl have the largest head angle of any animal?
Birds rotate their heads extremely freely due to the articulation of their spine with the skull. They have one occipital condyle, not two like mammals.
A condyle is a ball-shaped end of a bone that fits into a depression in another bone to form a joint. In addition, birds have a long, flexible neck with 11 to 23 movable vertebrae. Such a device reaches its limit in an owl: its head can rotate approximately 270 degrees in each direction.
Thus, the total range of rotational movements of the owl's head is one and a half full turns.
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Why do white pieces go first in chess and checkers?
Why the pieces of this color move first - no one knows for sure.
The age of chess is two and a half thousand years, and during this time the game has changed a lot. A long time ago it was called chutaranga, it was played by 4 people at the same time. There were figures in black, green, yellow and red (there was no white). Who went first was determined by rolling a dice.
But over time, the number of players was reduced to two, using black and yellow pieces. Subsequently, the yellow color was replaced by white.
It is believed that black is the color of sadness, the color of what is leaving. White is the color of life, the color of what is just beginning. Therefore, the white pieces start the game.
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Why do cats hate to drink water from a bowl next to their food?
Cats instinctively do not want to drink water from a cup next to their food bowl. Even though cats have been domesticated, they are still natural hunters.
In the wild, predators do not drink water close to where they have just successfully hunted, because that water may be contaminated by their recently killed prey. Of course, in domestic cats, this instinct is not so strong, and they drink water from a cup next to the food. But still, the instinct has not gone away.
So if you want to please your pet, put a bowl of water away from the feeding area.
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Why are there more right-handers than left-handers?
The fact is that the motor skills of the right side of the body are controlled by the left hemisphere of the brain, which is responsible for the logic and sequence of thinking. And in ancient times, these qualities were the key to survival for representatives of the species Homo sapiens. The most intelligent and logical, those who dominated the left hemisphere, survived and continued the race. And they also fixed a code in human DNA: the left hemisphere is dominant, the right hand is leading. Lefties are a rare exception to this rule.
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Why does the heart work all its life without getting tired?
The secret is that the heart, although it works throughout human life, still "finds" time to rest. Our motor consists of two atria and two ventricles.
The trick is that there is never a simultaneous contraction of the ventricles and atria - they always contract alternately.
If we calculate the time during which the heart is in a relaxed state, we get that it rests for about the same time as it works.
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Can the blood type change?
The blood type remains unchanged throughout a person's life. In theory, it can change during bone marrow surgery, but only if the patient's bone marrow has completely died, and the donor has a different blood type.
In practice, there are no such cases, and the doctor will first try to operate on a person with the help of a donor organ that has the same blood type.
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Does a bee die when it stings a person?
First, it is worth noting that wasps do not die after being bitten. However, such a nuisance can happen to a bee... It's all about the shape of the sting of these insects.
When a bee stings you, the sting seems to be screwed into the skin, since it has notches. An insect cannot safely pull out its sting without tearing it from its abdomen. The wasp's sting is sharp and smooth, so it can sting several times.
It is not completely clear, but some suggest that the fact is that the bee swarm consists of tens of thousands of individuals. Therefore, most insects "go to waste" for emergency protection. The wasp swarm is much smaller. The death of each worker greatly affects the entire "family". That is why these insects are more aggressive.
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Why is vacation an effective remedy for aging?
Experts from the Icon Medical School on Mount Sinai analyzed how rest affects the human body. Scientists have concluded that this not only improves the psychological state, but also reduces the number of biomarkers of aging in the blood.
The combination
of vacation with meditation turned out to be the most effective in this sense: even after 10 months, the stress level of vacationers remained reduced in this way.
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Are there territories in the world that do not belong to any State?
Of course, this is Antarctica. This is recognized by international treaties.
In addition, there are disputed territories that also have the status of terra nullius (no man's land). For example, Western Sahara.
And of course, there are countless islands, including those that are not open.
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Why did people start using paper money?
In the 7th century, during the Tang Dynasty, large merchants began to pay among themselves with paper receipts, leaving metal coins for safekeeping to trusted persons. In the 10th century, during the Song Dynasty, when there was a shortage of copper for coins, several of these "depositaries" were assigned the right to issue banknotes.
It was only around 1120 that the central government began to issue its own paper money.
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Why don't paper cups get wet?
Most of these paper cups on the outside are covered with a special plastic film inside. And this makes their processing simply impossible. According to statistics, 100,000 animals and 1 million birds die each year because they mistake plastic waste for food.
To contribute to the preservation of the environment, some ask to pour coffee into their thermo mug. And the owners of coffee houses give a discount to such conscious customers.
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Why does a person twitch when falling asleep?
We twitch, as a rule, not only falling asleep, but already in a dream. The twitches we feel happen when two parts of the brain are out of sync with each other. The mental part has not completely turned off yet, but the control over the muscles is already asleep.
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Why don't we remember how we were born?
A group of scientists believe that the loss of childhood memories is associated with an active process of formation of new cells called neurogenesis. According to Paul Frankland, recent studies have shown that neurogenesis is able to both form and erase information about the past.
We do not remember the first years of life because this time is the most active period of neurogenesis. Then the neurons begin to reproduce at a slower rate and cannot process some of the childhood memories.
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Cryptogangsters from Russia have created a new channel about cryptocurrencies and NFT in English!
Net profit in December is already 30 thousand dollars , and the exchange of information is completely free!
Find out the latest news from the world of blockchain, NFT and cryptocurrencies on their channel.
News | Crypto | NFT
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Why do we laugh when we hear jokes?
One can argue for a long time on why we laugh, but the object of laughter changes over time and depends on this particular society.
What happens to the listener when a joke is told? The left brain kicks in, starting to analyze the joke intellectually. Then the right hemisphere joins in, trying to find some common patterns of behavior in the joke (injuries to the left hemisphere of the brain sometimes lead to a complete inability to perceive humor).
Brain activity extends to the area of the brain responsible for processing information from our senses. Delta brain waves are generated.
Finally, the wave reaches its maximum when we understand the joke - and here we are already starting to giggle.
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Why is it customary to denote the unknown in mathematics with the letter "X"?
The story began in the 9th century in Khorezm on the territory of modern Uzbekistan, where the mathematician Al-Khwarizmi laid the foundations of the science of solving equations - algebra. Its name comes from the Arabic term "al-jabr", meaning the transfer of a member of the equation from the left side to the right side with a sign change.
Al-Khwarizmi did not yet use formulas and wrote equations in words. He called the unknown quantity "shey", in Arabic - "thing". For example: three "things" equals 15, so "thing" equals five. In the 12th century, the book of Al-Khwarizmi came to Spain, where they began to write the unknown as xei, since in Old Spanish the sound sh at the beginning of a word was denoted by the letter X.
With the development of the formulaic notation, the word was reduced to one letter.
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Why are hurricanes and tornadoes given female names?
During World War II, American military forecasters began to refer to Caribbean hurricanes after their wives and mother-in-laws, alluding to their violent temper. After the war, the US National Weather Service compiled a special alphabetical list of short and simple female names.
In 1950, the first naming system based on the military phonetic alphabet was developed, but in 1953 they returned to the use of female names.
Until 1979, they were only female, but later they decided to give hurricanes and male names.
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Why is the watch worn on the left hand?
Since the watch became a device that was used during work, it has become advisable to develop models of watches for wearing on the left hand, since most people own the right hand better than the left. When working, the main actions are performed with the right hand. To avoid damage, the watch was worn on the left hand.
In addition, the wristwatch had to be wound up, and the crown was on the right. In the end, it is possible that watch manufacturers simply followed the traditions and continued to make watches for wearing on the left hand.
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Why is the dollar green?
Because of the Civil War, Congress ordered the US Treasury Department to issue interest-free banknotes, which were called "greenback" for their color.
Banknotes first appeared in circulation in 1929, and the Bureau of Engraving used them again. There were several reasons for this: it was very resistant to chemical and physical influences, and there were a lot of paints of this color. And finally, the society has already psychologically correlated the green color with the credit bills of the American government.
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Why was rice not eaten in the original version of sushi?
Sushi appeared not in Japan, but in Southeast Asia, where boiled rice was used to ferment fish, so that it could be stored for a long time. However, only fish was eaten in these sushi, and sour rice from fermentation was thrown away.
Already the Japanese in the 14th and 16th centuries came up with the idea of adding vinegar to rice, which made it also suitable for consumption and accelerated the fermentation process. It was only at the beginning of the 19th century that chef Yehei Hanai suggested eating raw fish with rice, thereby creating modern sushi.
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Do peacocks grow new feathers that fall out of their tails?
A peacock without a beautiful tail is like a king without a crown, a tiger without stripes, or a cowboy without boots. As is customary with many other bird species, male peacocks are much brighter and more beautiful than females. This is necessary to win the attention of beautiful ladies during the mating games.But every year, towards the end of summer, peacocks stop caring for females, attracting them with their unusually beautiful pattern on their tail feathers. And at the same time, their plumage begins to gradually fall off. This process is the most common seasonal molting of birds.The fact is that peacock feathers can wear out over time and lose their functionality and beauty. And since these feathers cannot regenerate on their own, like skin, birds are forced to shed them.
After the end of the mating season, hormones are activated in the peacock's body, which trigger the molting process and promote the growth of new bright feathers.
Why are there no parachutes in civil aviation planes?
Firstly, the greatest number of accidents occur during takeoff and landing, and there is no oxygen to breathe at altitude. Secondly, special training is necessary for a successful parachute jump, and when trying to jump out of a liner in a crowd of passengers, the chances of rescue are close to zero.
Instead of providing passengers with unreliable means of individual rescue, it is more effective to invest in improving flight safety in general.
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Can a person drown in quicksand?
Quicksand consists of sand or clay and salt saturated with moisture and is most often found in river deltas. Their surface looks solid, but as soon as a human foot steps on it, the sand begins to liquefy.
It's easy to get stuck in such sands and it's quite difficult to get out alone, but it won't swallow you up.
But there is still a danger. If a person does not get free in time, he may be covered by a tidal wave. In this case, quicksand can really be dangerous.
The quicksand effect is found in full granaries.
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Why does the bull at the bullfight attack not the matador, but the red cloak?
The bull at the bullfight attacks the red cloak of the matador, which is called a muleta, not at all because he is annoyed by the red color — after all, cows do not distinguish colors. In fact, the bull reacts to the movement when the bullfighter swings the muleta.
An experiment was conducted. One man was dressed in a red suit, and the other in a black one. The red one stood still, and the black one ran. It's easy to guess that the bull "didn't like" the black guy.
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