Science

There are a huge variety of versions of the origin of man on Earth. Among them there are theories supported by archaeological finds and scientific research, and there are much more utopian ones. In any case, none of the versions has so far been able to absolutely convincingly prove. Last modified: 2025-01-23 12:01

Moving in any conductor, an electric current transfers some energy to it, which causes the conductor to heat up. Energy transfer is carried out at the level of molecules: as a result of the interaction of current electrons with ions or atoms of the conductor, part of the energy remains with the latter. The thermal effect of the current leads to a faster movement of the conductor particles. Then its internal energy increases and transforms into heat. Last modified: 2025-01-23 12:01

Discourse on the method of just reasoning and the search for truth in the sciences (French: Discours de la Méthode Pour bien conduire sa raison, et chercher la vérité dans les Sciences) is a philosophical and autobiographical treatise published by René Descartes in 1637. Last modified: 2025-01-23 12:01

The process is a crystal growth method used to produce single crystals of semiconductors (such as silicon, germanium and gallium arsenide), metals (such as palladium, platinum, silver, gold), s alts and synthetic gemstones. Last modified: 2025-01-23 12:01

Ontogeny of any organism is characterized by the formation of germ layers. In such primitive types of animals as coelenterates and sponges, the embryo consists of only two layers: endoderm and ectoderm. Over time, in more progressive forms of organisms, a third leaf appears - the mesoderm. Last modified: 2025-01-23 12:01

Ever since the primary school years, we all clearly learned the rule "you cannot divide by zero." But if in childhood you take a lot on faith and the words of an adult rarely raise doubts, then over time, sometimes you still want to understand the reasons, to understand why certain rules were established. Last modified: 2025-01-23 12:01

Characteristics of the constellation Peacock: designation, official borders, neighboring constellations. The history of the accumulation. Ancient Greek myth about the origin of the constellation. Objects of note: stars, exoplanets, deep sky objects. Last modified: 2025-01-23 12:01

Many people like to do tricks and experiments. Firstly, it is interesting, and secondly, it is an easy way to entertain children. Experiments with an egg help the child learn about the simplest chemical reactions and the laws of physics. Last modified: 2025-01-23 12:01

All representatives of the Chordata type are conditionally divided into higher and lower. The first includes the Vertebrate subtype, which is characterized by the presence of a skeleton of bones and cartilage. A typical taxon is a representative of the lower chordates, subphylum Cranial. A distinctive feature of this group is the presence of a chord at all stages of the life cycle. Last modified: 2025-01-23 12:01

Social constructivism is a theory of cognition and learning that argues that the categories of knowledge and reality are actively created by social relationships and interactions. According to social constructivist learning theory, each of us is formed through our own experiences and interactions. Last modified: 2025-01-23 12:01

Earlier, young people who wanted to gnaw at the granite of science could enter vocational schools, technical schools and universities. The first two types of educational institutions issued diplomas of specialized secondary education, and the last - of completed higher education. However, now the situation has changed somewhat. Applicant for a post - bachelor comes. “Is this higher education or not?” the employer thinks. The question, at least in Russia, is somewhat confusing. Let's try to figure it out. Last modified: 2025-01-23 12:01

What is the Monty Hall paradox? This is a clear illustration of the inability of a person to weigh his chances of success in terms of choosing a favorable outcome in the presence of more than one unfavorable. Last modified: 2025-01-23 12:01

Pierce Charles Sanders is an American philosopher, logician, mathematician and scientist, whom some call the "father of pragmatism". He was educated as a chemist and worked as a scientist for 30 years. He will be appreciated for his huge contribution to logic, mathematics, philosophy and semiotics. Also, the American scientist is popular for putting forward the main provisions of the philosophical current of pragmatism. Last modified: 2025-06-01 07:06

The most important organ, without which it is impossible to imagine the digestive processes of life. Human pharynx: what are its functions and structure?. Last modified: 2025-01-23 12:01

Today we will consider the basic concept of probability theory, learn how to solve problems using specific examples. Last modified: 2025-01-23 12:01

The gravitational drive has long been considered by scientists as a kind of pipe dream that looks beautiful in theory, but is not feasible in practical terms. However, in recent years, in connection with the development of certain areas of physical science, this type of perpetuum mobile began to gradually acquire quite real outlines. Last modified: 2025-01-23 12:01

Uzbekistan is a state in Central Asia, one of the former republics of the USSR. Moreover, this is the happiest post-Soviet country (according to the World Happiness Report). The article describes in detail the population of Uzbekistan, its size and ethnic composition. Last modified: 2025-06-01 07:06

Water is the basis of life. Without this substance, the existence of not a single living being on our planet is possible. How to analyze tap water? How to define quality? Together we will look for answers to the questions posed. Last modified: 2025-01-23 12:01

People study the culture and life of ancient civilizations, restoring the distant past from the remains, which are carefully dug up in the layers of the earth. This work requires great care and diligence, as over time the remains of the past become more fragile and dilapidated. Last modified: 2025-01-23 12:01

The article is devoted to steppe soils. The main characteristic features of such covers, features of chernozems and dry soils are considered. Last modified: 2025-01-23 12:01

What is the edaphic factor? How does it affect the life of plants and animals? Read the answers to these questions in the article. Last modified: 2025-01-23 12:01

Statistical methods of data analysis are described in sufficient detail in the domestic literature. In the practice of Russian enterprises, meanwhile, only some of them are used. Last modified: 2025-01-23 12:01

Specific electrical conductivity characterizes the general ability of a body to be a conductor of electric current. Last modified: 2025-01-23 12:01

Metals are the most important and in many ways unique chemical elements. Almost all of them are characterized by such properties as good electrical conductivity, gloss, thermal conductivity. At the same time, separate groups can be distinguished among them, the characteristics of which will differ significantly. Some of these distinctive features formed the basis of such a concept as the "activity series of metals". Last modified: 2025-01-23 12:01

Learn how to determine who the child will look like. What determines gender, eye color and other characteristics. Last modified: 2025-01-23 12:01

Encyclopedia is a unique publication that will help both schoolchildren to prepare for writing a report or message, and parents to learn a lot of new interesting facts. The most convenient thing is that now to get acquainted with encyclopedias it is not at all necessary to purchase these beautiful, but expensive books or visit libraries. Last modified: 2025-01-23 12:01

In social science, a person is a person who has certain social properties. Based on the definition, it can be understood that this concept is inextricably linked with society. Let's take a look at it in more detail. Last modified: 2025-01-23 12:01

Let's try to figure out what the process of socialization is, what functions it performs and what stages it consists of. Last modified: 2025-01-23 12:01

Modern people are the descendants of a small population of about 1-2 thousand people. Gradually, settlement occurred throughout the globe, and people were divided into races and adaptive traits, as a result of the impact of various environmental factors. From the article you will learn the characteristics of adaptive types of a person. Last modified: 2025-01-23 12:01

If the linear movement of bodies is described in classical mechanics using Newton's laws, then the characteristics of the movement of mechanical systems along circular trajectories are calculated using a special expression, which is called the equation of moments. What moments are we talking about and what is the meaning of this equation? These and other questions are discussed in the article. Last modified: 2025-01-23 12:01

A lighter-than-air aircraft uses Archimedean - buoyant - force to lift. It is also called an aerostat. This device is equipped with a shell filled with hot air or a gas having a lower density than the surrounding atmosphere. Last modified: 2025-01-23 12:01

Sleep experts recommend using white noise. It can be the sounds of nature, the buzzing of a vacuum cleaner and others. They are no less effective than mother's lullaby. Last modified: 2025-01-23 12:01

Chemistry is the foundation of our life. All household items consist of compounds of the elements of the periodic table. Every minute in the human body there are complex transformations in which chemicals are involved. This article will talk about the metal molybdenum: where it is used, its properties and role in the human body. Last modified: 2025-06-01 07:06

It is proved that the cells of eukaryotic organisms are represented by a system of membranes that form organelles of protein-phospholipid composition. However, there is an important exception to this rule. Two organelles (cell center and ribosome), as well as movement organelles (flagella and cilia) have a non-membrane structure. How are they educated?. Last modified: 2025-01-23 12:01

The article describes the main phases of the life cycle of stars, as well as their features. The properties of stars are described, as well as some facts from the history of studying the evolution of stars. Last modified: 2025-01-23 12:01

Familiarization with the information contained in this article will allow the reader to learn about one of the methods of cell division - amitosis. We will find out the features of the course of this process, consider the differences from other types of division and much more. Last modified: 2025-01-23 12:01

Without knowing the past, there is no way to the future. A well-known and common term that is used in modern literature - genealogy - is the compilation of a family tree and the search for one's ancestors. In fact, everything is not so simple. Genealogy is a doctrine with its own laws and postulates, which are quite difficult for the consciousness of the layman. Last modified: 2025-01-23 12:01

This article focuses on different types of worms, in particular flatworms, roundworms, and annelids. A special place will be allocated to flatworms. Their various bodies and their activities will be reviewed. For example, we will analyze how flatworms breathe, study the structure of the excretory and reproductive systems, etc. And some of their representatives will also be considered. Last modified: 2025-01-23 12:01

The concept of "intelligence quotient" was introduced by the German psychologist William Stern. He used IQ as an acronym for the term Intelligenz-Quotient - intelligence quotient. IQ was a score obtained from a series of standardized tests conducted under the guidance of a psychologist in order to determine the level of intelligence. Last modified: 2025-06-01 07:06

Alcohol and alcohol are quite tightly integrated into our daily lives. This article will give basic guidelines on how to distinguish methyl from ethyl alcohol. Their characteristics and chemical formulas will also be indicated. Last modified: 2025-01-23 12:01