What does historical science study? Detailed answer

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What does historical science study? Detailed answer

Big encyclopedia for children and adults

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What does history study?

The process of development of human society, its past. The purpose of studying history is to know the past, on this basis to identify the patterns of development of human society and determine the prospects for its future development.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What is protoplasm?

The secret of protoplasm is the secret of life itself. We still don't know what makes protoplasm alive. Protoplasm is the living substance of all plants and animals. All organisms - plants and animals - are made up of cells.

There can be many millions of cells, as in the human body, or there may be only one, like in protozoa - the simplest single-celled organism. But the cells of all living beings contain a living substance - protoplasm. In every cell, protoplasm is contained in two main parts: in the harder central part of the cell - the nucleus and in the soft, more fluid part - the cytoplasm. Any living being contains its own kind of protoplasm.

Different types of cells in the body have their own specific forms of protoplasm. 99% of the protoplasm of its total volume consists of carbon, hydrogen, oxygen, nitrogen and a small amount of other elements. Food entering a living organism is first digested and takes on a liquid form. The digested food can then become part of the protoplasm. This process is called assimilation. It has not yet been fully studied, it is not known exactly how it proceeds.

It is known that the result of assimilation is the restoration of the "worn" and the creation of a new protoplasm. In the process, the protoplasm surrounds the dead substance with living material and replaces the foreign substance with a similar one.

Protoplasm also accumulates and realizes all the energy of plants and animals. Protoplasm is exposed to the external environment. Bright light or heat can kill her. Chemicals attract or repel protoplasm. An electric current produces the same effect on it if you change its direction.

If someday science discovers the secret of how protoplasm works, we will be able to penetrate deeper into the secret of life itself.

Test your knowledge! Did you know...

▪ Why, in September 1945, on the eve of the arrival in the French capital of the English microbiologist Alexander Fleming, the Parisian newspapers wrote that he made more whole divisions to defeat fascism and liberate France?

▪ What is inside an atom?

▪ What allusions to French cinema are found during the performance of the song 33 cows?

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