A selection of incredible but true facts. Why don't people sneeze in their sleep? The most incredible facts

This selection will definitely expand your horizons. Look!

Why are eyebrows needed?

This is a natural “headband” that we inherited from our ancestors. Eyebrows prevent acrid sweat and raindrops from rolling down from your forehead directly into your eyes. There is a possibility that the invention of umbrellas and hats, as well as the ruthless evolution over the coming millennia, will remove eyebrows from the list of organs necessary for survival and procreation. Because of this, women of the fourth millennium will no longer need to track discounts on plucking and styling on beauty salon Instagrams.

How does dirt appear in the navel?

The accumulation of dirt in the navel is - no joke - the most mysterious physical process on the human body. Austrian chemist Georg Steinheiser studied the formation process and composition of “umbilical mud” and published the results of his scientific research in 2010. It turns out that during the day, the hairs around the navel collect fibers from clothing and push them inside, where they mix with dust particles, beads of sweat and microscopic particles of skin, falling into clumps. To combat this scourge, says Steinheiser, you can either shave the hair around the problem area or get a piercing: the metal will repel dirt and there will be nothing to pick out in the shower in the evenings.

What does the subway smell like?

Creosote is a special chemical that is used to lubricate wooden sleepers and other subway parts. In the quantities in which it is in the air at stations, it is non-toxic and does not cause any unpleasant effects, except for reactions in allergy sufferers. In the subways of other cities (New York, Tokyo, London and even CIS cities - Minsk and Kyiv) this characteristic smell is not present.

If the mother of Russian cities is Kyiv, then who is the father?

First, we need to figure out why Kyiv is still a “mother”, despite the masculine gender. The pre-revolutionary spelling of Kyiv is “Kiev”. The hard sign at the end did not sound anything in the 19th century, but indicated the hardness of the previous consonant sound. But in IX it was pronounced as an unstressed “o” (for example, like the first two “o” in the word “milk”). During the reign of Prince Oleg, who called Kyiv “the mother of Russian cities,” the word was read as “Kieva” and belonged to the feminine gender. The pope of Russian cities, according to historians, is Novgorod. It was built before Kyiv, and served as an important trading hub - it was the beginning of the legendary route “From the Varangians to the Greeks.”

Do penguins have knees?

There are two sets. The first is the so-called tarsus, which looks like a backwards-turned knee, which almost all birds have, and a real functional knee that connects the femur and tibia.

The problem is that the penguins' tarsus is too close to the foot, and the knee itself is too close to the body. Therefore, the lower legs of penguins look like a solid, rigid structure.

Where does the excavated soil go after the construction of the metro?

She doesn’t disappear anywhere without a trace. Depending on the quality of the resulting soil, the soil is sent either for processing and disposal to technical enterprises, for example, to construction sites in Moscow and the region, or, if it is of good quality, for landscaping parks and forest areas.

What dreams do blind people see?

People who are blind from birth actually see dreams that do not have visual images. Dreams may contain sounds, smells and touches in various combinations, but they will not even have color or light elements. People who have lost their sight during their lives experience normal dreams. Their brightness decreases year after year: colors disappear and images blur, until eventually they fade to zero.

Why do traffic police officers have striped batons?

The contrasting black and white coloring is equally noticeable both in the city and in the field at any time of the day and in any weather. The traffic police came to the idea of painting the batons black and white 77 years ago. Before this, back at the beginning of the century, until traffic lights appeared and the traffic flow grew to the modern endless traffic jam for the entire city, traffic controllers made do with first all-white and then red-yellow wands, similar to lightsabers from Star Wars. . Then the USSR launched a bold but unsuccessful experiment: for several years they made do with white gloves and a special set of gestures. It was after the fiasco of this venture that the traffic controllers were given the famous black and white sticks.

What is the most popular word in Russian?

A special organization of linguists that monitors the state of the Russian language found out in 2014 that the most popular word in the Russian language is the interjection “damn”, which is used in speech even more often than the pronouns “I” and “you”. This says a lot about the state of modern Russian speech.

Will a gun fire in space?

It will definitely shoot once. A bullet, devoid of air friction, gravity and other obstacles, will fly for a very long time and very far (quite likely millions of kilometers) until it falls into the gravitational zone of a star or extinguishes inertia in another way, but the shooter will have to fight with the recoil from shot, spinning around its axis and coping with nausea and disorientation. The second, third and other shots may well not happen: in order for some parts of the gun to work as required, they need an air gap to compensate for the friction of the parts. So every shot in space will render the gun unusable a thousand times faster than on Earth.

What causes "butterflies in the stomach"?

Adrenalin. For the brain, falling in love is very little different from other types of stress, such as grief or danger. This is why lovers eat little and sleep poorly. As soon as a person sees a loved one, the brain recognizes this as a stress signal and begins to pump adrenaline through the vessels. Please note: you most likely experienced the same sensations in your stomach before an important exam or before an important interview.

Why don't people sneeze in their sleep?

First, you need to understand how people sneeze: the brain receives information about irritation, transmits a signal to the chest muscles to fill the lungs with air, closes the holes in the throat and gives a signal to exhale. The air ends up exploding through the nasopharynx. It is impossible to sneeze in a dream, because problems occur at the very first stage: the brain receives a signal about irritation, but due to the fact that the nervous system works in a suppressed “sleep” mode, it cannot do anything about it except to wake up the owner, if the irritation is strong enough. And then, you won’t be able to sneeze immediately after getting up: the nervous system has not yet entered working mode.

Why are some dreams so difficult to remember?

During sleep, norepinephrine is not released - a hormone that, among its other duties, is responsible for fixing memories in long-term memory. An interesting detail: norepinephrine is released during lightning stressful situations: injuries and burns, as well as during serious nervous shocks, states of anxiety and fear. This is why nightmares and disturbing dreams are much more memorable than good dreams.

Why do some drinks taste bad after brushing my teeth?

The toothpaste contains sodium lauryl sulfate. It is added as a foaming agent, which makes brushing your teeth easier and distributes the paste more evenly throughout the mouth. The substance is not considered harmful, but may cause an allergic reaction or irritation. Another thing is that upon contact with the tongue, sodium lauryl sulfate suppresses the receptors responsible for sweetness. In addition, the component temporarily destroys the phospholipid layer, which suppresses the bitterness of food. So it turns out that the taste of food and drinks that a person consumes immediately after thoroughly brushing his teeth changes beyond recognition and not for the better.

Why does ice cream hurt my forehead?

The effect is called “brain freeze” and is observed in a third of people living on earth. Unpleasant pressing sensations in the forehead or behind the ears are caused by the fact that from the cold in the mouth (specifically in the palate), the brain is “scared” that the cold will soon reach it, and begins to urgently pump warm blood to itself. Because of this, blood flow is disrupted for some time, and unpleasant sensations arise in the head. In science, the effect is called sphenopalatative ganglioneuralgia. You can make warning stickers and use them to mark ice cream in stores.

What happens to the pages of deceased people on social networks?

In most cases - nothing. There is still no automatic deletion of a page after a certain period of inactivity in many social networks. For example, pages on Facebook, Odnoklassniki and VKontakte remain forever. However, Twitter deletes a profile in which no new posts have appeared for more than six months. In other cases, pages change status. Facebook allows you to turn a user profile into a “memorial”. To do this, you need to send a copy of the death certificate to the network administration. The status of the page will change - the inscription “In loving memory of...” will appear, and you can continue to leave comments and entries on the wall. When changing status, access to personal correspondence is not transferred to either relatives or other close people. Your secrets will definitely remain yours forever. A single solution to the problem of the social network has not yet been developed, but in the coming years it is already worth having in stock: around 2050, the number of pages of the dead will be equal to the number of profiles of the living, and then the ratio will change in favor of the dead.

Page 1

Accurate facts, indisputable facts - this is what is especially intolerable for this type of writers and this is what is especially necessary if you want to seriously understand a complex and difficult issue, which is often deliberately confused.

We need accurate facts that can be verified and clear conclusions. Experience shows that the process of persuasion is complicated by the influence of such factors as the quality and emotional acceptability of the arguments for the interlocutor, their relevance for proving a specific thesis, and finally, the circumstances in which the process of persuasion takes place. Situations will often arise when seemingly indisputable arguments based on genuine facts turn out to be unconvincing, but arguments that boil down to; characteristics of a person whose judgments are supported or contradicted.

Are my proposals supported by accurate facts and figures?

A Marxist must take into account living life, the exact facts of reality, and not continue to cling to the theory of yesterday...

In response to this, I must state the exact facts. Trummer, this is the Polish Partei vorstand, because he has not belonged to the party for a whole year. For a year now he has not been in organizational connection with either the Central Committee of the party, which was elected at the January 1912 conference 882, or with the so-called Organizing Commission of the Liquidators.

The great importance Vladimir Ilyich attached to statistics, precise facts, indisputable facts is clearly seen from his works, from those drafts, extracts and calculations that preceded these works.

The self-proclaimed prince avoided naming any exact facts and names that could be refuted as a result of verification.

Cooperation with the media should be based only on accurate facts and Data. The accuracy of the information provided must be checked systematically and repeatedly. If the facts are found to have been accidentally or deliberately distorted, public trust is lost forever.

Along with this, throughout antiquity and the Middle Ages, those exact facts that should form the basis of all scientific knowledge slowly accumulated.

Such a conclusion seemed monstrous at that time, but Euler, having already had in his hands an exact fact directly confirming this, did not see it for some reasons unclear to us.

Duclos's work is fundamentally not much different from the work of Iordis and only contains more precise facts and details of the problem of structure.

To give a directive to the Soviet and party press from the indicated point of view to evaluate the Berlin agreement, revealing in particular detail the exact fact of the actual connection between the villages.

The definitions of the concepts of a random process and a stationary random process given here are not precise and rely more on the reader’s intuition than on exact facts.

As for the further transformation of aspartic aldehyde into protein, this is no longer a hypothesis, but a simple manipulation of formulas, not based on exact facts or even analogies. The benefits of this kind of manipulation completely elude me.

Unlike previous books, where a lot of space is devoted to philosophical issues, in this work, written in a strict, concise language, the author confines himself mainly to exact facts. Thus, in the preface to the first edition of this work, Agricola writes: I allowed myself to prudently pass over in silence everything that I myself did not see or read or did not learn from people worthy of trust. Thus, I have indicated only what I myself saw and what, having read or heard, I myself comprehended. This work, both in the laconicism of its presentation and in the clarity of the information given there, has the character of an instructional manual, which was subsequently preserved in books of a similar type, written after Agricola and in imitation of him.

Newborns typically have about 270 bones, most of which are very small. This makes the skeleton more flexible and helps the baby pass through the birth canal and grow quickly. As we grow older, many of these bones fuse together. The adult human skeleton consists on average of 200–213 bones.

2. The Eiffel Tower grows 15 centimeters in summer

The huge structure is built with temperature expansion joints, allowing the steel to expand and contract without any damage.

When steel heats up, it begins to expand and takes up more volume. This is called thermal expansion. Conversely, a drop in temperature leads to a decrease in volume. For this reason, large structures, such as bridges, are built with expansion joints that allow them to change in size without damage.

3. 20% of oxygen comes from the Amazon rainforest

Flickr.com/thiagomarra

The Amazon rainforest covers 5.5 million square kilometers. The Amazon jungle produces a significant portion of the oxygen on Earth, absorbing huge amounts of carbon dioxide, which is why it is often called the lungs of the planet.

4. Some metals are so reactive that they explode even when in contact with water.

Some metals and compounds - potassium, sodium, lithium, rubidium and cesium - exhibit increased chemical activity, so they can ignite with lightning speed when in contact with air, and if they are placed in water, they can even explode.

5. A teaspoon of a neutron star would weigh 6 billion tons.

Neutron stars are the remains of massive stars, consisting mainly of a neutron core covered with a relatively thin (about 1 km) crust of matter in the form of heavy atomic nuclei and electrons. The cores of stars that died during a supernova explosion were compressed under the influence of gravity. This is how super-dense neutron stars were formed. Astronomers have found that the mass of neutron stars can be comparable to the mass of the Sun, although their radius does not exceed 10–20 kilometers.

6. Every year, Hawaii gets 7.5 cm closer to Alaska.

The earth's crust consists of several huge parts - tectonic plates. These plates are constantly moving along with the upper layer of the mantle. Hawaii is located in the middle part of the Pacific Plate, which is slowly drifting northwest toward the North American Plate, on which Alaska is located. Tectonic plates move at the same speed as human fingernails grow.

7. In 2.3 billion years, the Earth will be too hot to support life.

Our planet will eventually become an endless desert, similar to today's Mars. Over hundreds of millions of years, the Sun has warmed up, become brighter and hotter, and will continue to do so. In more than two billion years, temperatures will be so high that the oceans that make Earth habitable will evaporate. The entire planet will turn into an endless desert. As scientists predict, in the next few billion years the Sun will turn into a red giant and completely engulf the Earth - the planet will definitely come to an end.

Flickr.com/andy999

Thermal imagers are able to identify an object by the heat it emits. And polar bears are experts at staying warm. Thanks to a thick layer of subcutaneous fat and a warm fur coat, bears are able to withstand even the coldest days in the Arctic.

9. Light will take 8 minutes 19 seconds to travel from the Sun to the Earth

It is known that the speed of light is 300,000 kilometers per second. But even at such breakneck speed, it will take time to cover the distance between the Sun and Earth. And 8 minutes is not so much on a cosmic scale. It takes sunlight 5.5 hours to reach Pluto.

10. If you remove all the interatomic space, humanity will fit in a sugar cube

In fact, more than 99.9999% of an atom is empty space. An atom consists of a tiny, dense nucleus surrounded by a cloud of electrons, which occupy proportionately more space. This is because electrons move in waves. They can only exist where the crests and troughs of the waves are formed in a certain way. Electrons do not remain at one point; their location can be anywhere within the orbit. And therefore they take up a lot of space.

11. Stomach juice can dissolve razor blades

The stomach digests food thanks to caustic hydrochloric acid with a high pH (hydrogen index) - from two to three. But at the same time, the acid also affects the gastric mucosa, which, however, can quickly recover. The lining of your stomach is completely renewed every four days.

Scientists have many versions of why this happens. The most likely: due to huge asteroids that influenced its course in the past, or due to strong circulation of air currents in the upper atmosphere.

13. A flea can accelerate faster than the space shuttle

Flea jumps reach mind-boggling heights - 8 centimeters per millisecond. Each jump gives the flea an acceleration 50 times greater than the acceleration of the spacecraft.

What interesting facts do you know?

Interesting scientific facts

1. Pseudo-blindness is a phenomenon in which blind people have a physiological response to visual stimuli (for example, an angry face), despite the fact that they are unable to see them.

2. If a thimble was filled with matter from a neutron star, it would weigh almost 100 million tons.

3. If people used Newton's formulas instead of Einstein's theory of relativity, GPS calculations would be off by several kilometers.

4. The coldest place in the known universe is on Earth in a laboratory. Scientists have managed to freeze atoms using laser cooling. This resulted in temperatures in the billionth degree of absolute zero.

5. The human brain has more synapses than stars in the Milky Way.

6. If it were possible to remove all the empty space in atoms, then Everest could be placed in a glass.

7. The compound that gives raspberries its flavor is found throughout our Galaxy. You heard that right, the Milky Way tastes like raspberries.

8. According to the Hafele-Keating experiment, time runs faster when flying in a western direction than in an eastern direction (relative to the center of the Earth).

New interesting facts

9. All the cells in your body have been dividing since life began on Earth. And all this division will end with your death, with the exception of the cells that you pass on to your descendants (1 per child) and certain circumstances (for example, organ donation).

10. The only reason you are able to read this article is because hundreds of kilometers of fiberglass cables lie on the ocean floor.

11. The lubricant in your knees is one of the slipperiest substances known to man.

12. When you remember an event in the past, you are not remembering the event itself, but rather the last time you remembered it. In other words, you have a memory of memories. For this reason, people's memories are often inaccurate.