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Recent Channel Posts

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WHY is it dangerous for cats and dogs to go extinct? Many cats and dogs, especially ornamental breeds, are almost incapable of making their own food in the wild. Even urban stray dogs and cats live mostly off people - intentional feeding and food scraps. Furthermore, even completely feral dogs tend to lose competition to wild dogs like wolves, coyotes, etc. Living in the same territory as them, without human support, willing or unwilling, they quickly become extinct. However, in the absence of wild competitors, some dogs and cats are quite capable of mastering an independent life. The most famous example is the Australian dingo, the feral descendant of domestic dogs, now the largest predator in the Australian fauna. In Australia, as well as in a number of other places, there are stable populations of feral domestic cats.

275

11:00

25.04.2025

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WHY is maple syrup hard to obtain? The tradition of maple sap harvesting, borrowed by Canadians from the Indians, took shape in their favorite and annually held in March, the national holiday of the inhabitants of Southern Quebec and Ontario. It is possible to get 20-25 liters of the most valuable sap from one tree only from sugar maple (Acer saccharinum). These trees, which reach 30 m in height, grow in the south-east of Canada. To collect the sap, an incision is made on the trunk, approximately 20-30 cm above the ground, into which tubes are inserted leading to vessels where the sap, called passoka, flows. To obtain a sweet maple syrup or sugar, which instead of sucrose contains more useful dektrose and trace elements, the juice is thickened by evaporation. It takes 40 liters of juice to make 1 liter of syrup. Maple syrup is an essential ingredient in many Canadian dishes. It is used in ice cream, soufflés, porridges and even some meat dishes.

634

18:00

24.04.2025

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WHY do persimmons cease to be astringent after freezing? The astringent taste of persimmons comes from tannins, substances of a phenolic nature. The fruit has enzymes in its tissues capable of hydrolyzing these compounds, which leads to the destruction of the latter. However, tannins and enzymes in the unripe fruit reside in different intracellular structures separated from each other by membranes. During freezing, ice crystals rupture the membranes, and after defrosting, the tannins are hydrolyzed. Their destruction also occurs as the fruit ripens, so a fully ripe persimmon is not astringent.

738

11:00

24.04.2025

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WHY do people blink? Studies tell us that the average person blinks once every 2 to 10 seconds. We do this automatically as our eyelids protect our eyes from damage. Sometimes we blink intentionally, using what is called "sign language". As an example, we may blink to get attention, inviting another person to flirt. Sometimes we blink to express surprise, as if to say, "I can't believe my eyes!" In humans, the inner surface of the upper and lower eyelids, as well as the eyes themselves, are lined with a thin, almost transparent membrane, the conjunctiva. The conjunctiva serves to moisten the surface of the eyes, because they need moisture to move properly. During blinking, the eyelid spreads moisture through the conjunctiva and also directs it to the corners of the eye.

875

18:00

23.04.2025

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WHY does a dozen bear a separate name? For it has many divisors A dozen is the smallest number that has six different divisors, four of which are in a row: 1, 2, 3, 4, 6, 12. It is convenient in use, so counting in dozens was used in some monetary systems and in cattle breeding, where derivatives were also used. Inch dozens are grosses (144) and dozen grosses are masses (1728). We are left with the division of the dial into 12 hours and the word "dozen" from duodecimal counting.

916

11:00

23.04.2025

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WHY is the unknown in mathematics commonly denoted by the letter x? The Spaniards used this letter to write the Arabic word for "thing”. The story began in the ninth century in Khorezm in what is now Uzbekistan, where the mathematician Al-Khorezmi laid the foundations of the science of solving equations - algebra. Its name comes from the Arabic term "al-jabr," which means the transfer of an equation term from the left side to the right side with a change in sign.

1001

18:00

22.04.2025

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WHY can't bees fly over mirrors? In 1963, the Austrian entomologist Herbert Heran and the German behavioral scientist Martin Lindauer noticed something strange about the way honeybees fly through the air. When a group of bees was trained to fly over a lake, they could only fly safely to the other shore if there were waves and ripples on the surface of the water. At the same time, when the lake was mirror-smooth, the insects suddenly lost their orientation - and even fell into the water. The results of that study confirmed the idea that bees use visual cues to navigate during flight. In other words, when the surface below the bees is mirrored, the insects assume that the ground below them is much farther away than it really is, and they lower their altitude to the limit.

1034

11:00

22.04.2025

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WHY do humans live longer than other mammals? Scientists may have just discovered a major key to the search for immortality by discovering that our lifespan is inextricably linked to the rate by which our cells undergo genetic mutations. Although it is logical to assume that our probability of death increases as these mutations accumulate over time, such a hypothesis fails to account for an inconsistency known as the Peto paradox. If death depends on the accumulation of somatic mutations, then larger species with more cells should receive more mutations and therefore have shorter lifespans. For example, the authors found that human cells undergo an average of 47 replacement mutations per year, giving us an average lifespan of 83.7 years.

1079

18:00

21.04.2025

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WHY do astronauts sleep near the ventilation system? Basically, astronauts sleep in special modules in the form of horizontal and vertical cabins, similar to showers. A person in weightlessness feels indifferent to sleeping upside down. However, the position is usually controlled by lightning bags attached by special cables to the walls. Many astronauts use earplugs to sleep, as the station is always noisy. Also, there is a fan next to the sleeping area that creates the necessary air flow so that the astronaut does not sleep in the bubble of carbon dioxide that he himself creates. Otherwise, it would result in guaranteed oxygen deprivation and provide the person with a severe headache. It is noteworthy that in space, the Sun rises every hour and a half, so astronauts have a clear daily routine that they are forced to follow.

1108

11:00

21.04.2025

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WHY does earwax form? We occasionally have to clean the yellowish mass out of our ears. Where does it come from? The fact is that our external auditory canal has four thousand wax glands. These glands just produce a substance called earwax. Since wax is so sticky, dust and dirt clings to it. Thus, it protects the ears from contamination, not allowing dirt to penetrate far inside. It is strictly forbidden to clean your ears with thin objects, such as matches. You could damage your eardrums. Some people produce more earwax than others. If too much wax is produced, it can block the ear canals and cause hearing loss. In such cases, you should definitely see a doctor.

1151

18:00

20.04.2025

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