And here we go again ;) Is it harmful to crack your fingers? Probably not. Finger crunching is considered a bad habit, and podiatrists advise to get rid of it. Meanwhile, the American doctor Donald Unger put a curious experiment: more than 60 years, he daily crunched the fingers on his left hand, but did not do it on the right. By the age of 83, he had failed to notice a difference in the condition of his knuckles, and neither of his hands showed signs of arthritis. This unique research was awarded the 2009 IG Nobel prize. Why does a person hiccup? Hiccups — a process in which the body wants to get rid of the load from the so-called vagus nerve. The vagus nerve connects many internal organs to the Central nervous system. It runs from the chest to the abdomen, closely adjacent to the esophagus. Together with the esophagus, this nerve squeezes through a narrow opening in the diaphragm — the muscle-tendon septum that separates the chest cavity from the abdomen. Then it goes to the st
And here we go again ;)
Is it harmful to crack your fingers?
Probably not.
Finger crunching is considered a bad habit, and podiatrists advise to get rid of it. Meanwhile, the American doctor Donald Unger put a curious experiment: more than 60 years, he daily crunched the fingers on his left hand, but did not do it on the right. By the age of 83, he had failed to notice a difference in the condition of his knuckles, and neither of his hands showed signs of arthritis. This unique research was awarded the 2009 IG Nobel prize.
Why does a person hiccup?
Hiccups — a process in which the body wants to get rid of the load from the so-called vagus nerve.
The vagus nerve connects many internal organs to the Central nervous system. It runs from the chest to the abdomen, closely adjacent to the esophagus. Together with the esophagus, this nerve squeezes through a narrow opening in the diaphragm — the muscle-tendon septum that separates the chest cavity from the abdomen. Then it goes to the stomach and other abdominal organs.
This is the narrowest place in the region of the diaphragm and is the center of origin of the hiccups. In hasty eating, when quite large pieces of food pass through the esophagus, the vagus nerve is injured: pressed and irritated. This is possible even when overeating, as well as in an uncomfortable position, when the nerve is compressed, and even when frightened, when there is a sharp breath. Babies have hiccups when they're cold.
Compression of this nerve is fraught with a violation of the functions of many organs, so the body quickly and actively responds to the inconvenience. It sends a signal to the Central nervous system. And it, in turn, activates the diaphragmatic nerve responsible for contractions of the diaphragm.
Hiccups are the result of regular ("pulsating") activity of the diaphragmatic nerve, which causes the diaphragm to contract with powerful and abrupt movements. The sound that occurs is the result of a sharp closing of the glottis. Hiccups are an involuntary reaction, the so-called unconditional reflex, that is, we can not consciously control it.
Why does metal ring?
Due to its elasticity
With a small deformation in the metal there are forces that seek to restore the original shape. But these forces "bend the stick": the metal skips the equilibrium position and with acceleration deformed in the opposite direction. Then the elastic forces change direction, and everything repeats. There are sound vibrations that pass from the metal into the air. The oscillation frequencies depend on the elastic properties of the material, as well as on the mass and shape of the object made of it. Predicting how a particular object will ring is not easy. Therefore, in the old days so valued bell masters who knew how to choose the right alloy and cast the right shape.
Why don't batteries charge instantly?
Some are charging. But also discharged quickly
The simplest battery is a capacitor that stores energy in the form of an electric field between the plates. It is charged instantly (it is enough for the charges from the wire to get on the plates), but stores energy for a short time because of leaks. Batteries store energy due to reversible chemical reactions, the rate of which is limited by the mobility of ions in the electrolyte and the surface area of the electrodes. There is an intermediate type of battery-ionistors. These are nanotechnology "supercapacitors" that charge and discharge much faster than batteries, and their capacity is many times higher than capacitors.
Why are people more sympathetic to the dog than the human?
American sociologists from northeastern University in Boston explained why people tend to sympathize with beaten dogs, rather than other adults.
The study conducted a social survey of 240 young men and women aged 18 to 25 years, students at various universities in Boston. Scientists gave volunteers fake Newspapers with articles describing cases of beating a one-year-old child, a dog, an adult or a puppy. The texts of all reports differed only in the names and descriptions of the victim of violence.
At the end of reading the notes, the researchers asked participants to assess the degree of their own sympathy for the hero of the story. It turned out that the volunteers had more empathy for battered dogs, children and puppies, rather than adults.
Scientists concluded that the main influence on the results is the age of the victim,but not its species. People perceive dogs as" big " puppies or even children — helpless and demanding care. Presumably, similar patterns should be manifested for other Pets.
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