Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library


BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

Have people always lived in families? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Comments on the article Comments on the article

Did you know?

Have people always lived in families?

No one knows how the first family arose. Excavations in ancient caves show that men, women and children lived together in small groups. But these groups were not families of father, mother, and children (as we understand it now), although women probably cared primarily for their own children. The "family" kept the fire and protected themselves from wild animals with the help of primitive weapons.

The family way of life is more necessary for a person than for other living beings. And this is because the most helpless creature on earth is a human child.

Most insects and other lower life forms can move and feed as soon as they are born. But the young of higher forms of life - human or animal - must be fed and protected. The father usually brings food for the mother and protects the baby from enemies. The role of the mother is more important, as she feeds the cub with milk.

Thus, the family appeared because it is necessary for the joint upbringing of offspring. During the hundreds of thousands of years that family life has existed, various forms of family organization have developed among different peoples. In some tribes, the mother's brother stood at the head of the family, and the father had little to do with the children. Pharaohs in ancient Egypt married their sisters.

In biblical times and earlier, a man could have two or more wives. Women of some nations could have several husbands. A marriage in which a man or woman could have more than one spouse is called polygamy. There are still families in Africa and the Middle East where there are several wives, but this custom seems to be dying out.

Author: Likum A.

 Random interesting fact from the Great Encyclopedia:

What would happen if there was no dust?

Would the world really be a much better place if there were no dust? The answer is: in some respects yes, in others no. What is dust, exactly? It is made up of particles of soil or other solid matter, and these particles are light enough to be lifted and carried by the wind. Where do these particles come from? Their source may be the remains of flora or fauna, sea salt, volcanic sand and desert sand, ash or soot.

In most cases, dust is undesirable and useless. But, on the other hand, it helps to make the world more beautiful! The wonderful colors of sunrises and sunsets owe their beauty to a large extent to the dust scattered in the air. Dust particles in the upper air layers reflect the sun's rays. This makes sunlight visible for another hour or two after sunset. The colors that make up sunlight are refracted at different angles, reflecting off dust and water vapor particles scattered in the air. Sunsets are red because these particles refract the red rays of the sun in such a way that they become the last rays to disappear from view.

Another important function of dust is associated with rain. The water vapor in the air would not liquefy too quickly if it weren't for the dust particles that serve as the center for each drop of water. Therefore, clouds, fog, rain are mainly formed from countless dust particles enveloped in liquid.

 Test your knowledge! Did you know...

▪ What is the most common mammal?

▪ Where can you see and taste natural watermelon snow?

▪ Why do people have different sensitivity to extraneous noise during sleep?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Translucent OLED display by Everdisplay 25.10.2015

Everdisplay introduced its first transparent OLED display. The light transmission of a 5,57-inch panel is approximately 40%, so it is more correct to call it translucent. The panel is characterized by a density of 264 pixels per inch.

The translucent panels, as conceived by the manufacturer, can find application in consumer electronics, including household appliances such as refrigerators.

Simultaneously, other OLED panel prototypes were shown, including a qHD (960 x 540 pixel) flexible panel measuring 5,6 inches diagonally.

Other interesting news:

▪ Furnace for radio lovers

▪ Tonometer works by touch

▪ New spacesuits for astronauts from Boeing

▪ Thermal curtains

▪ Google self-driving cars take to the roads

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ section of the site Alternative energy sources. Article selection

▪ Article Shamefully indifferent to good and evil. Popular expression

▪ Article How old is the Earth? Detailed answer

▪ Baobab article. Legends, cultivation, methods of application

▪ article Powder firewood as an alternative motor fuel. Encyclopedia of radio electronics and electrical engineering

▪ article Two designs of the 430 MHz band. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

Name:


Email (optional):


A comment:





All languages ​​of this page

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua

www.diagram.com.ua
2000-2024