Science

Tetrahedron in Greek means "tetrahedron". This geometric figure has four faces, four vertices and six edges. The edges are triangles. Basically, a tetrahedron is a triangular pyramid. The first mention of polyhedra appeared long before the existence of Plato. Last modified: 2025-01-23 12:01

Coagulation of water: the physical basis of the process, the most common coagulants. Purpose of technology and factors affecting its effectiveness. Stages of the technological process and the equipment used. Combination with other types of impact on water and improving the quality of its purification. Last modified: 2025-06-01 07:06

The impact of various chemicals on the human body is ambiguous. Most of the known compounds are either neutral or play a positive role in human life. But there is a group of substances that pose a serious threat to he alth. Last modified: 2025-01-23 12:01

For many years, humanity cannot unequivocally answer the question of what is the impact of the parade of planets on human he alth and the well-being of the inhabitants of the Earth. The fact is that the science of astrology is very closely intertwined with various beliefs and Vedic practices. Many false prophets and soothsayers intimidate people in every possible way with terrible predictions about the end of the world, associating it with the alignment of the planets. Last modified: 2025-01-23 12:01

In our article we will look at what an analyzer is. Every second a person receives information from the environment. He is so accustomed to this that he does not even think about the mechanisms of its receipt, analysis, formation of a response. It turns out that complex systems are responsible for the implementation of this function. Last modified: 2025-01-23 12:01

Wilhelm Schickard was a German astronomer, mathematician and cartographer of the early 17th century. In 1623 he invented one of the first calculating machines. He proposed to Kepler the mechanical means for calculating ephemerides developed by him and contributed to improving the accuracy of maps. Last modified: 2025-01-23 12:01

One of the most amazing and mysterious planets of the solar system - Mercury. Even more surprisingly, the diameter of Mercury has decreased and, quite possibly, will continue to decrease in the future. Last modified: 2025-01-23 12:01

General Savin Alexey Yurievich - head of the Soviet Brain Wars program. With his participation, they searched, found and educated people with exceptional abilities, came up with a technique for making a genius out of an average person. Last modified: 2025-01-23 12:01

The 21st century is the century of radio electronics, the atom, space exploration and ultrasound. The science of ultrasound is relatively young today. At the end of the 19th century, P. N. Lebedev, a Russian physiologist, conducted his first studies. After that, many eminent scientists began to study ultrasound. Last modified: 2025-01-23 12:01

When and why was the Abel Prize founded? Who has been awarded this award over the years? Information - in the article. Last modified: 2025-01-23 12:01

Organic life in the process of evolution has adapted to possible fluctuations in living conditions. It is this adaptability of the plant and animal world that allows you to maintain viability and continue to exist. Last modified: 2025-01-23 12:01

Social communities of people were considered differently by philosophers at different stages of human development. In the 19th century, class theory was very popular. This concept called classes the main social groups. They, from her point of view, determined the course of history. Last modified: 2025-01-23 12:01

As people explored the cosmos, the thought of finding alien life became more and more intriguing. With the development of technology, it became possible to study the planets closest to the Earth. One of them was Mars - the fourth planet in the solar system, surprisingly similar to Earth, but as if outdated and already cooled down. Last modified: 2025-01-23 12:01

The scientific complex of Russia is now going through a difficult period. Since the era of perestroika, its structures have been continuously reorganized, abolished, reformed, optimized - depending on the current problems in the country and society and the competence of those leaders who are called upon to solve these problems. Last modified: 2025-01-23 12:01

Most of the enzymes for the implementation of catalytic activity needs auxiliary elements - cofactors. These substances are non-protein in nature and are not always a structural part of the enzyme molecule. The complex of a protein and a cofactor is called a holoenzyme, and only the protein part is called an apoenzyme. A cofactor that is permanently part of an enzyme and is linked to it by covalent bonds is called a prosthetic group. Last modified: 2025-01-23 12:01

Chronostratigraphic classification has a common goal. It consists in the systematic division of the sequence of layers of the planet into subdivisions. They have their own names that correspond to intervals of geological time. Last modified: 2025-01-23 12:01

What is a scale? This is such a sign system for which the display is specified. The scale element is assigned to real objects. We can say that the measurement scale is a graduated ruler, on which the values of any quantity (distance, temperature, pressure) are plotted. The problem associated with ensuring high quality products is inextricably linked to the quality of measurements. Last modified: 2025-01-23 12:01

Many are interested in the question: do fish feel pain. It is especially relevant for fans of fishing who would like to know how much their passion causes suffering in living beings. We invite you to familiarize yourself. Last modified: 2025-01-23 12:01

Can you name the most fusible metal? Hint: In its normal state, it is liquid, silvery and highly poisonous. Guessed? In any case, let's find out more about him. Last modified: 2025-01-23 12:01

All contemporaries have long known that horrendous arms race organized by the Americans and the Soviet Union after the end of World War II. And the main object in this action was space, which is used far from being for good and peaceful purposes. So, by the end of the fifties of the last century, all the world's media were trumpeting not only about satellite launches, but about thundered nuclear explosions in outer space closest to the Earth. Last modified: 2025-01-23 12:01

The very first impression is formed when looking around the face. Men are especially attracted to beautiful, well-defined female lips. Women are not indifferent to men with a strong-willed chin and sensual lips. Physiognomy tries to study facial features that can attract people or repel them. She claims that the inner world of a person is a direct reflection of his appearance. Last modified: 2025-01-23 12:01

Habitat is the natural environment in which an organism lives. Animals require different amounts of space. Habitats are scattered over the vast territory of the planet Earth. Each is characterized by a certain biological diversity of the animal and plant world, whose representatives unevenly populate our planet. The air-terrestrial habitat includes areas of the earth's surface such as mountains, savannas, forests, tundra, polar ice and others. Last modified: 2025-01-23 12:01

By the end of the 19th century, organic chemistry was formed as a science. Interesting facts will help you better understand the world around you and find out how new scientific discoveries were made. Last modified: 2025-01-23 12:01

Geoid is a model of the Earth's figure (i.e., its analogue in size and shape), which coincides with the mean sea level, and in continental regions is determined by the spirit level. Serves as a reference surface from which topographic heights and ocean depths are measured. Last modified: 2025-01-23 12:01

Mars and Venus are similar to the Earth, so scientists do not lose hope of finding life on neighboring planets. For Mars, this is more likely. The Curiosity rover was able to find out for sure that rivers once flowed there, which means that there was an atmosphere. Perhaps life on Mars existed long before Earth or will be possible after terraforming (changes in climatic conditions). This requires the presence of a magnetic field on Mars. Last modified: 2025-01-23 12:01

Methods of titrimetric analysis are necessary to establish the qualitative and quantitative composition of the desired substance or ion. Let's analyze their varieties, main characteristics. Last modified: 2025-01-23 12:01

What happens when you cross a leech with a spider? Surprisingly, such an unusual animal actually exists in nature. The ability to throw out a kind of web from the body in order to capture prey is possessed by nemertine worms. It is about them that we will talk in the presented material. Last modified: 2025-01-23 12:01

Setting the priority of engineering and technology for the development of society in the theoretical and methodological sense is called technological determinism. This idea was formed at the beginning of the last century, was reflected in philosophy and sociology, but the modern system of knowledge radically changes the idea of the place and participation of technology and man in the development of social consciousness, the socio-economic life of society, in the sciences and scientific and technological progress. Last modified: 2025-01-23 12:01

No matter where you live in Russia, in any case, you can, raising your eyes to the sky, see the constellation called Crater (lat.), or Chalice. Astronomy lovers who often explore the celestial sphere know that the best time to study this constellation is March. If you are watching the Chalice from the Southern Hemisphere, you will be able to make sure that with the onset of April this constellation occupies the highest position above the horizon. It also has a mythical story about Apollo. Last modified: 2025-01-23 12:01

Rose is one of the most popular flowers in the world. Many love it for its exceptional aroma and sophisticated beauty. When compiling a scientific description of this plant, usually, in addition to the appearance, they talk about growing conditions, a wide variety of rose varieties, their beneficial properties and breeding history. Last modified: 2025-01-23 12:01

A dog with two heads is an experiment of the 20th century that was left without much attention in the USSR, but caused a stir abroad. The procedure looks intimidating, but the results that Demikhov received stun every person. Last modified: 2025-01-23 12:01

Metrology is the science of measurement. It establishes a common understanding of the units that are critical to the measurement of any human activity. Modern metrology dates back to the period of the French Revolution, when it was necessary to standardize units in France. Then a single length standard was proposed, taken from scientific sources. Last modified: 2025-01-23 12:01

What is the combustion temperature of diesel fuel. Consider the most established combustion model for a conventional diesel engine. This process is primarily controlled by mixing, which can occur due to the diffusion of fuel and air before ignition. Last modified: 2025-01-23 12:01

A quick glance at the state of science about the study of the mysteries of the human brain, you understand that technology is not yet fully able to dissolve the myths of a sophisticated reader. The size of the studies does not reflect the probability of the truth about our body, which can not be said about the psyche.. Last modified: 2025-01-23 12:01

Outstanding biologist Alexei Yablokov was a man-epoch. He is known as an active world-famous environmentalist, political and public figure, professor and doctor of science. In 2005, the scientist created the Green Russia faction as part of the Yabloko party and led it until the last days of his life. Last modified: 2025-01-23 12:01

The transformer is a versatile piece of equipment needed in power plants, businesses and even homes. Almost every electrical device provides for the presence of this device to lower the voltage coming from the outlet. Last modified: 2025-01-23 12:01

Bromothymol blue refers to laboratory chemicals. It is mainly used for titration of weak acids and alkalis. The color of the solution changes from yellow to intense blue. There are other areas of application. Last modified: 2025-06-01 07:06

What is the effect of electromagnetic fields on the human body, and why is the invisible force manifested so strongly in the form of ailments and poor he alth? How is our biofield protected from magnetic waves? Will the "shell" of a person be destroyed if it is experimentally acted upon with special force?. Last modified: 2025-01-23 12:01

The phenomenon of friction in human life plays both a positive and a negative role. On the one hand, without its presence, movement would be impossible, on the other hand, due to friction, huge losses of energy and working materials occur. In the article, we will consider from the point of view of physics what friction is, as well as how to find the coefficient of friction. Last modified: 2025-01-23 12:01

Soviet, and then Russian scientist, academician of the Russian Academy of Sciences, Zhukov Vasily Ivanovich in 2006 organized the Social University of Russia and became its first rector. All the activities of this party functionary took place in the field of social sciences and in the field of the Ministry of Education. It was here that Vasily Ivanovich Zhukov became an Honored Scientist of the Russian Federation and received an award from the Government of the Russian Federation. Last modified: 2025-01-23 12:01