What is the optimal number of social connections for a person? Detailed answer

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What is the optimal number of social connections for a person? Detailed answer

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What is the optimal number of social connections for a person?

English anthropologist Robert Dunbar has identified a relationship between the size of the neocortex of the cerebral hemispheres of primates and the size of their flock. Based on these data, he determined the optimal size of social ties for a person - 150. This number is confirmed in a variety of historical periods and locations: for example, this is the estimated number of inhabitants of a Neolithic settlement or the size of a basic unit of the Roman army. In 2010, Dunbar began researching the social network Facebook and came to the conclusion that his number also works there: despite the fact that some people have hundreds and thousands of friends on social networks, the average person can interact effectively with no more than 150 contacts.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What is a heart attack?

What is called a heart attack (heart attack) is one of the most common causes of death in the Western world. In three cases out of four, the victim is a male, usually between fifty and seventy years of age. A typical heart attack is caused by coronary thrombosis. Many call it simply thrombosis.

This disease begins in the coronary arteries, two blood vessels that supply the heart with blood. When one of these arteries becomes blocked, the blood supply to part of the heart is cut off. Part of the tissue in this part of the heart begins to degenerate and die, as if it had been injured. When one coronary artery becomes blocked, small branches of another artery take over its tasks for a while. After some time, most of the parts of the heart cut off from the blood supply receive the blood they need.

If the second artery is able to do the work for two, then the person remains alive. Fortunately, in most cases, the second artery is able to do this job, helping the heart cope with stress during this period of time.

For many, a heart attack begins after increased physical exertion, nervous breakdown, extreme cold, excess food - in all cases when the heart has to work harder than usual. All this is not always the cause of a heart attack, but there is still a relationship.

However, in many cases, a heart attack can occur when a person is in a calm state. Symptoms of a heart attack usually include chest pain. But pain can also be felt in the arms, neck, or left shoulder. There is sweating and shortness of breath. The victim of an attack may turn pale and be in shock, and the pulse may become very weak. When these symptoms appear, you should call a doctor.

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Fine grinding for the pig 31.05.2016

How to grind corn for pig feed? It would seem that for tenderness, the pig is remarkable because it will eat everything. However, animal breeders from the University of Illinois, led by Oscar Rojas, decided to clarify this issue.

Typically, corn is crushed into particles of 650 microns. The researchers also took other sizes - 865, 677, 485, and 339 microns. 3,6-3,87% fat was added to the feed with large particles, and only 2% to the feed with small particles. And what? There was no difference: the pigs gained weight equally, and their meat quality was similar. In other words, just by grinding it was possible to save 1,5% of the fats added to the feed. The difference seems insignificant, but if there is a lot of food, then the savings in money can come out tangible. And the reason is clear: a pig spends less energy on digesting small food.

On the other hand, there is a suspicion that small feed can provoke stomach ulcers in pigs, so the researchers recommend protecting animals from unnecessary stress.

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