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

When did the first instruments appear? 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?

When did the first instruments appear?

The ax and the stone scraper were the very first tools. They were used by the ancestors of modern man millions of years ago. The first real tools were the axe, hammer and knife. A stone ax appeared no later than a quarter of a million years ago, a metal knife - 8 thousand years ago.

The oldest nail appeared in the Middle East in 3500 BC. e. A copper nail connected the two parts of the copper statue. The screw and nut appeared in Europe with the beginning of the New Age, around 1550.

The Egyptians knew the saw 5000 years ago and used it to cut wood and soft stone. Traces of processing with this tool are visible on the blocks that make up the pyramids.

The oldest planer known to us appeared in ancient Rome. The planer found in Pompeii is very similar to the modern one.

Author: Mendeleev V.A.

 Random interesting fact from the Great Encyclopedia:

What world-famous and beatified person confessed to the lack of faith within himself?

Mother Teresa, who devoted her life to serving the poor and sick people and received the Nobel Peace Prize for this, repeatedly admitted her doubts about faith, and even her complete absence, over the last 50 years of her life. However, after her death, she was beatified by the Catholic Church.

 Test your knowledge! Did you know...

▪ Why did the famous Athenian Daedalus flee from his native city?

▪ What do we breathe?

▪ What type of garbage do city birds repel parasites in their nests?

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:

The world's tallest astronomical observatory opened 04.05.2024

Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>

Controlling objects using air currents 04.05.2024

The development of robotics continues to open up new prospects for us in the field of automation and control of various objects. Recently, Finnish scientists presented an innovative approach to controlling humanoid robots using air currents. This method promises to revolutionize the way objects are manipulated and open new horizons in the field of robotics. The idea of ​​controlling objects using air currents is not new, but until recently, implementing such concepts remained a challenge. Finnish researchers have developed an innovative method that allows robots to manipulate objects using special air jets as "air fingers". The air flow control algorithm, developed by a team of specialists, is based on a thorough study of the movement of objects in the air flow. The air jet control system, carried out using special motors, allows you to direct objects without resorting to physical ... >>

Purebred dogs get sick no more often than purebred dogs 03.05.2024

Caring for the health of our pets is an important aspect of the life of every dog ​​owner. However, there is a common assumption that purebred dogs are more susceptible to diseases compared to mixed dogs. New research led by researchers at the Texas School of Veterinary Medicine and Biomedical Sciences brings new perspective to this question. A study conducted by the Dog Aging Project (DAP) of more than 27 companion dogs found that purebred and mixed dogs were generally equally likely to experience various diseases. Although some breeds may be more susceptible to certain diseases, the overall diagnosis rate is virtually the same between both groups. The Dog Aging Project's chief veterinarian, Dr. Keith Creevy, notes that there are several well-known diseases that are more common in certain breeds of dogs, which supports the notion that purebred dogs are more susceptible to disease. ... >>

Random news from the Archive

Smart fabric from Apple 28.12.2017

Apple has received a European patent for "smart fabric". Such a fabric can be used in clothes and furniture, a case or a strap for an electronic device, endowing them with new qualities.

A feature of smart fabric is the presence of fibers with certain properties - conductivity, sensitivity to touch or deformation. These fibers can be both single and twisted into threads, including simultaneously with fibers from other materials. In addition, cavities may be formed in the tissue for other components. Other components can also be attached to the fabric using electrical and mechanical bonds.

The list of things that can be integrated into fabric includes integrated circuits and discrete electronic components, from resistors and capacitors to loudspeakers and various sensors.

Other interesting news:

▪ New MOSFETs for automotive applications from Toshiba

▪ Found the relationship between musical taste and personality type

▪ Electromagnetic generator operating without fuel

▪ When learning a language, it is better to write by hand

▪ Convertible necklace headset from Samsung

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ site section Infrared technology. Article selection

▪ article visual illusions. Encyclopedia

▪ article In what part of the human body are the plumbing, the beak, the worm, and the toes of the seahorse? Detailed answer

▪ article Sandy grate. Legends, cultivation, methods of application

▪ article Mast for a large windage antenna. Encyclopedia of radio electronics and electrical engineering

▪ article Broadband phase shifters. 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