How did the handshake come about? Detailed answer

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How did the handshake come about? Detailed answer

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How did the handshake come about?

Today, when meeting or parting, a handshake is considered quite natural. But, probably, many things that we do without thinking were once very symbolic. In primitive life, for example, the hand could be a symbol of power and strength. It was used in battles with enemies, hunting, for the manufacture of weapons and tools. Thus, a hand extended towards another person could symbolize peaceful intentions, since this gesture began to mean the absence of weapons or the desire to fight.

It is known that gesticulation was important in ancient religion, for example, as a sign of power. The Greeks prayed to their gods with their hands up. At one time, a sign of respect for elders was a gesture, which was a combination of hands palm to palm. Once among the Arabs there was a custom to kiss the hands of the elders. Later, polite Arabs began to resist those who wanted to kiss their hands. They tried to get ahead of the kiss by shaking both hands at the same time.

The ancient Greeks offered their right hand when they wanted to express friendly feelings to a stranger. Thus, for centuries, the human hand and gestures have had a lot of meaning. And when we, without hesitation, shake hands with each other, in fact, we continue the tradition that has come down to us from antiquity.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How do seeds propagate in nature?

Seeds, as you know, are one of the ways a plant reproduces another similar plant. But seeds require special conditions to grow. They need moisture, oxygen and warmth. If the seed does not begin to grow within a certain time, it dies. Therefore, it is very important for seeds to get to the right place at the right time. Fortunately, there are at least eight ways to distribute seeds.

Let's look at each of them. One of them is based on the fact that on the surface of many seeds there are hooks, spines and thorns. They cling to the skin of passing animals, to the clothes of people, and thus are transported. Another type of seed may be called "sticky". These seeds are found in sticky berries. When the berries are pecked by birds, some of the seeds stick to their beaks, which are carried over long distances.

Seeds of plants growing in or near water often fall into mud or water. When birds or animals walk along the shore in search of food, mud sticks to their paws, which often contains seeds. Some seeds serve as food for various animals. Squirrels, birds and insects feed on certain types of seeds. Since not all the seeds that they pick up are eaten, the rest are carried to different places and scattered.

Man himself scatters many seeds without knowing it. The grain contains many seeds that are so small that they cannot be weeded out, and when grain is transported, these seeds travel with it. Some seeds "fly" to new places. Many of them have fluffy shoots, with the help of which they are picked up by the wind. Maple seeds, for example, grow in pairs, each with a winglet.

Some other seeds are parachute-shaped and easily carried by the wind. Certain types of seeds can be called "swimmers". They fall into the water and the wind drives them away. Finally, there are plants in which seeds are propagated by means of an explosion. When their fruits dry up, they suddenly burst and the seeds from them are scattered several feet around.

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A new organ found in the human body 07.04.2018

A group of American scientists led by Professor Neil Theise of New York University discovered a new organ in the human body, the detection of which has so far been hampered by the limitations of the standard technique.

The new organ is a branched system of interconnected cavities in the connective tissue that permeates the entire body. The walls of these cavities are made up of cells that look like fibroblasts and contain fibers of strong collagen and elastin proteins. The cavities themselves are filled with fluid and open into the lymph nodes.

The cavities included in this system are found under the skin, as well as in the "lining" of many muscular organs: the gastrointestinal tract, bladder, lungs, and blood vessels. Scientists believe that the newly discovered organ acts as a "shock absorber", protecting muscle tissue from damage during contraction and relaxation.

However, its role in the work of our body, apparently, does not end there. It seems that these cavities are also involved in the formation of edema and fibrosis; in addition, metastases of cancerous tumors and the substances that feed them spread through them. For the first time, scientists saw them when examining the bile ducts of a cancer patient.

The new organ was called "interstitium" (interstitium).

Why was this discovery not made earlier? The fact is that the standard method of histological examination (i.e., the study of body tissues) is based on fixing them with special chemicals and dividing them into thin sections, which are examined under a microscope. At the same time, the liquid flows out of the cavities and they become invisible.

However, Teise and colleagues used a different approach: they injected a fluorescent dye into the patient's living tissues, illuminated them with a laser, and inserted an endoscope into the patient's body. As a result, the interstitium was examined in detail.

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