Why is the cloth on most billiard tables green? Detailed answer

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

Why is the cloth on most billiard tables green? Detailed answer

Big encyclopedia for children and adults

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

Did you know?

Why is the cloth on most billiard tables green?

Billiards evolved from outdoor games with sticks and balls and is somewhat related to golf and croquet. Therefore, in tribute to tradition, the cloth on most billiard tables is green, like the color of the grass.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Why are some people afraid of heights?

As humans, we are subject not only to physical pain, but also to emotional "pain." Any situation can cause us a strong emotional shock. Sometimes we react quite simply to it. For example, we may scream, blush, or break out in sweat. But sometimes, when the emotional load is too great or our resistance is weak, we may show a different reaction to these loads. One of them is called the phobic reaction.

This means that the emotional load, or excitement, anxiety is combined with a specific object or situation. If the object that causes such a state is avoided, the anxiety state with which it is associated can also be prevented. Some of the common phobias are the fear of enclosed, cramped spaces, large, open spaces, crowds, heights, darkness, animals, or germs.

Of course, a person who has such a phobia (fear of heights, for example) does not understand where he got it from. The only thing he knows is that he is afraid of a certain situation and therefore avoids it. He may even be aware that his fear has no reason. To illustrate this point, let's consider a child growing up in an ordinary family: he loves his family, but sometimes he is afraid of one of them.

For example, he may be afraid of his father, even if he loves him. It is unpleasant for him to realize that he is afraid of his father, so he subconsciously hides this feeling. He can transfer this fear to something high, and from here he may develop a fear of heights. It is necessary to know that many people suffer from such fears, and these anxiety conditions can be cured with the help of medicine. We must show sympathy and understanding towards those who suffer from such a disease.

Test your knowledge! Did you know...

▪ How did Achilles, the greatest Greek hero of the Trojan War, die?

▪ What is the difference between VAT and excise?

▪ How did the struggle for the revival of the greatness of France take place?

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:

A New Way to Control and Manipulate Optical Signals 05.05.2024

The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>

Primium Seneca keyboard 05.05.2024

Keyboards are an integral part of our daily computer work. However, one of the main problems that users face is noise, especially in the case of premium models. But with the new Seneca keyboard from Norbauer & Co, that may change. Seneca is not just a keyboard, it is the result of five years of development work to create the ideal device. Every aspect of this keyboard, from acoustic properties to mechanical characteristics, has been carefully considered and balanced. One of the key features of Seneca is its silent stabilizers, which solve the noise problem common to many keyboards. In addition, the keyboard supports various key widths, making it convenient for any user. Although Seneca is not yet available for purchase, it is scheduled for release in late summer. Norbauer & Co's Seneca represents new standards in keyboard design. Her ... >>

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. ... >>

Random news from the Archive

graphene chip 20.05.2006

Scientists from France and the USA have created a microcircuit from single-layer graphite. About two years ago, American scientists obtained another (if we count in the series graphite-diamond-carbine-fullerene-nanotube, then the sixth) form of carbon, namely a graphite sheet one atom thick. This form was called graphene.

As it turned out, such a substance may well compete with nanotubes in future devices of micro- (more precisely, nano-) electronics. Nanotubes are considered very promising because they conduct electric current well, while the electron in them exhibits interesting quantum properties. But it is difficult to assemble microcircuits from nanotubes. This requires non-standard equipment made on the basis of probe microscopes. And soldering nanotubes to other circuit elements is not easy.

“We came up with the idea that a nanotube is actually nothing more than a sheet of graphene rolled into a roll,” says Professor Walt de Heer from the Georgia Tech University. “Using thin strips of graphene, we will preserve all the unique properties of nanotubes. Because they are connected precisely with the structure of the network of carbon atoms, and not with how it is twisted.

Scientists heated a silicon carbide plate in a vacuum and ensured that all silicon atoms flew off its surface. It turned out, of course, not quite graphene, but a thin, ten interatomic distances thick, graphite film. Further, using standard methods of photolithography, that is, by applying masks and subsequent etching, standard microcircuit elements were obtained from a graphite film.

Other interesting news:

▪ Buildings of the future

▪ Programmable processor based on DNA molecules

▪ The aliens didn't find us

▪ Underwater volcanoes can warm entire continents

▪ Self-driving seats from Nissan

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Consumer Electronics. Selection of articles

▪ article Hoe-shifter. Drawing, description

▪ article Who Invented the Compass? Detailed answer

▪ article Electronic engineer. Job description

▪ article Power supply. Protection of equipment from emergency operation of the network, uninterruptible power supply units. Directory

▪ article Rope session (several tricks). Focus secret

Leave your comment on this article:

All languages of this page

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