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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.
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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.
News | Crypto | NFT
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How did the history of toilet paper begin in our time?
In 1857, New York businessman Joseph Gaietti released toilet paper cut into neat squares and packed in bundles.
He was so proud of his invention that he printed his name on every piece of paper.
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Why does our right ear hear speech better, and our left ear hears music better?
The right and left hemispheres of the human brain are not completely identical. If we talk about sounds, then the left hemisphere is responsible for deciphering the information we have heard, and the right hemisphere distinguishes the shades and tones of these sounds. Scientists have known about this for a long time, as it is due to the fact that the left hemisphere is responsible for analytical thinking, while the right hemisphere is associated with creativity and emotions.
However, a new study has shown that these differences are revealed already in the process of processing sounds with the ears. The cells of the ear respond to sound by expanding and contracting to increase vibrations, which are then converted into nerve impulses entering the brain.
It was for this reaction that it was noted that the right ear responds better to a number of rhythmic sounds resembling human speech, while the left ear prefers music.
Tigers can jump forward up to 6 m and up to 5 m.
Their legs are so muscular and powerful that tigers can stay standing even after being killed.
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From the category "The first 40 years of childhood in a man's life are the most difficult"😄
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Chopping firewood in Darwin's mode
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❗️My dear subscribers, I would like to ask you for a couple of minutes of your attention. Just yesterday I found out that 😱😳 this NFT image was bought for $100 and resold for $6 MILLION 😳😱
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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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Is it true that the ace was the lowest card in the deck?
Ace in English is called "ace", which, in turn, comes from the Old French word "as" with the meaning "unit". Historically, the ace in the playing deck had the lowest value and was designated by the sign 1, but over time, on the contrary, it became the dominant card.
And in games such as poker or blackjack, the player can choose the value of the ace himself — as the highest or as a unit. The French Revolution had a great influence on the ace's upward movement — it began to symbolize the primacy of an ordinary person over kings.
In addition to cards, the word "ace" began to be applied to people who have reached the highest degree of mastery in their profession.
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Why does everyone have their own timbre of voice?
The timbre of a person's voice is determined by two concepts: overtone and formant.
As you know, the pitch of the sound depends on the frequency of the sound wave that our vocal apparatus extracts (diaphragm, lungs, ligaments, etc.), that is, on how often the vibrations of this wave occur.
Contrary to popular belief, all people, animals and instruments emit sounds of different frequencies. The only frequency of only one instrument (besides electronic ones) is a tuning fork.
In addition to the sounds of the main (which we perceive as a single) frequency, we also extract sounds of additional frequencies - overtones. Overtones are always higher than the sounds of the fundamental frequency, and there are always an integer number of them. The timbre of our voice depends on the number of overtones.
There are overtones that have more power than others: they sound brighter. These overtones are called formants. They also determine what the timbre of the voice will be.
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Why do insects survive falling from a great height?
It turns out that the point here is in two factors — the shape of the bugs' body and the air resistance. By the first factor, we mean the surface area of the insect's body. As you know, with an increase in this area, the frontal resistance of the body to the air flow also increases. When a body falls, gravity acts on it, which is determined by the mass and acceleration of free fall. It is hindered by the drag force, which depends on the density of the medium, the rate of fall, the area of the body and the aerodynamic characteristics of the medium. The mass of insects, as a rule, is several tens of grams, so the force of gravity acting on their body is quite small. At the same time, the drag on the air flow turns out to be significant, which is why the resulting force determining the acceleration with which it moves turns out to be relatively small.
Because of this, the insect lands on the ground at a relatively slower speed.
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Engineering approach to stash
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