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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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In the 1980s, a certain James Clark learned how to open street payphones and stole a total of half a million dollars in 25-cent coins from them. He operated in 30 states and even twice got on the list of "most wanted criminals".
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A sheet of paper folded 42 times will reach the moon. This is not a mistake. When folded, the thickness increases exponentially. Mathematical calculation shows that a sheet of paper 0.1 mm thick, folded 23 times, will have a thickness of 1 km, folded 30 times - will reach outer space. Unfortunately, such a paper addition is physically impossible.
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How to store bananas so that they don't turn black?
Bananas should be stored at room temperature, but not in a plastic bag, but in an open form. In the package, bananas evaporate condensate, "sweat" and quickly rot. There is an opinion that it is best to store bananas in a suspended form, in a dark, cool room, at a temperature of about + 14. Then they stay yellow longer and do not turn black.
But where can I find such a place in the apartment?
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How will a jump from an airplane into the sea without a parachute end?
There is almost no chance of survival
First, you need to find a large object that you could "bump into" during the fall. In addition, the chances of surviving a deadly dive may increase slightly if your body is "hidden". This will help to absorb some of the huge amount of energy that you will experience when you collide with the surface of the water.
Secondly, in order to survive, you need to control the position of your body when entering the water. This means that you need to take a position that will provide the minimum surface area of your body to withstand the brunt of the force. As soon as you "break" through the surface of the water, you will start to stop very quickly. The force exerted on your body due to such a sharp and rapid change in speed will be too great to cope with it.
Such a force would cause a huge amount of internal hemorrhages and fatal injuries.
Is it true that in the Northern and Southern Hemispheres, water flows in different directions during runoff?
The effect is associated with the rotation of the Earth and the action of the Coriolis force.
Coriolis forces are the force of inertia acting on a material point when moving relative to a rotating frame of reference (in this case, the planet Earth). This causes objects moving on the Earth's surface to deviate to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. In the case of flowing down an inclined concave surface, this will lead to a counterclockwise and clockwise movement, respectively.
But there is a very important factor — the degree of influence of this force. And it depends, on the one hand, on the shape of the funnel and adjacent surfaces, on the other - on the flow parameters and latitude. In other words, the smaller the scale of the flow and the closer we are to the equator, the more microscopic the influence of the Coriolis force against the background of other forces.
Therefore, one should not hope for a stable operation of the effect at the equator. As in general for success in the bathroom.
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Why does the heartbeat consist of paired beats?
These sounds are generated by the work of different parts of the heart and different valves. The first beat is the sound of reverberation (reflection) of blood in the left atrium when the mitral (atrioventricular) valve closes. This marks the end of pumping a portion of blood from the atrium to the ventricle. The second stroke is created by the reverberation of blood in the left ventricle, when the ventricular-aortic valve closes, and means the end of the release of part of the blood into the aorta.
In the right parts of the heart, the beats are weaker and therefore not audible.
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Why were many scientific discoveries made in a dream?
This is due to the fact that during sleep, our brain interprets the information already embedded in it in a completely different way. It is in a dream that processing, sorting and analysis of all the data received during the day takes place. Sometimes they result in a real discovery. For example, the structure of the atom appeared to Niels Bohr in a dream, as well as the formula of benzene to the chemist Friedrich Kekula. Richard Wagner claimed that he also did not invent his creation "Tristan and Isolde" himself, but simply heard it in a dream.
What do you say, have you ever noticed brilliant ideas in a dream?
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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 didn't Einstein like to comb his hair?
In his youth, Albert Einstein wore a neat, smooth hairstyle — until his son Hans was born. Like many new fathers, Einstein quickly realized that a growing family requires increasing costs. At that time he was working as a patent clerk and he didn't have an extra cent. And then Einstein refused to visit the hairdresser - once and for all.
⠀
So his iconic disheveled hair appeared. When the hair grew too much, Einstein's wife took scissors and cut off all the excess. As for combing his hair, the great scientist did not waste his precious time on it either.
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Why is it nice to give gifts?
Scientists have found that in the process of generosity, the same areas of the brain that participate in the reward system and provide a feeling of happiness are activated in a person.
Neuroscientists from Germany, the USA and Switzerland invited 50 people to find out what processes occur in the human brain during the manifestation of generosity. Half of the volunteers were asked to figure out how they would spend 100 Swiss francs (about 7000 rubles) on themselves. The rest of the participants had to decide how to spend the money on others. Before and after the experiment, scientists assessed the subjective "happiness level" of the volunteers (how happy the participants themselves considered themselves).
It turned out that planning gifts to friends and relatives improved the mood much more.
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There was such a punctuation mark - a point of percontation . A reversed question mark later referred to as a rhetorical question mark, was proposed by Henry Denham in the 1580s and was used at the end of a question that does not require an answer—a rhetorical question. Its use died out in the 17th century.
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Salvador Dali once painted a picture for the prisoners of Rikers Island Prison in New York. It hung in the dining room for 15 years, later it was moved to the hall. In 2003, the painting was stolen by security guards, and it has not been found yet.
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Can a person be born and live without a brain?
The unequivocal answer is no. More precisely, a person can be born without a brain, but in this case the fetus is born immediately dead. This condition is called anencephaly. This is a congenital defect in which the brain and the bones of the skull do not have time to fully form while the baby is in the womb. As a result, the child's brain develops minimally.
Anencephaly is considered a violation of the formation of the neural tube of the fetus during the period of 21-28 days of pregnancy. The neural tube is a narrow trunk that usually closes during fetal development and forms the brain and spinal cord.
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Russian scientists have found a way to make up for the lack of fresh water
The development involves the production of sorbents based on graphene oxide - superhydrophobic aerogels, which make it possible to purify water from organic pollutants, including dyes, solvents and other waste from light industry enterprises. Experts believe they have found a way to make up for the growing shortage of fresh water.
It is planned to further optimize the composition and structure of the aerogel, for example, to add silver nanoparticles to it to provide a bactericidal effect. The development will appear on the market approximately in 2025-2026.
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How much oxygen does one houseplant produce?
Few. Oxygen is only a by-product of the synthesis of organic matter from carbon dioxide and water, so it is released only by a growing plant that increases its mass. The dry weight of the biomass produced by a plant at one time or another is approximately equal to the weight of oxygen released by it into the atmosphere at the same time. Calculations show that even an intensively growing small plant produces no more than 1% of the oxygen consumed by humans.
I've been telling my wife for a long time, it's necessary to throw away all these flowers, I just go sneezing from them
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Why do people want to smoke when they drink?
In America, various studies have been conducted on this topic. According to the results of one of them, conducted in a medical center, it was decided that alcohol enhances the pleasant sensations of smoking.
According to the results of another one made at a medical university, it was found out that nicotine allows you to drink more alcohol without experiencing drowsiness.
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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.
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