Science

The time zones of the United States of America are six time zones. They affect the lives of not only US citizens, but also the daily routine of the population of neighboring countries. Last modified: 2025-01-23 12:01

The article tells about what nuclear fission is, how this process was discovered and described. Its use as a source of energy and nuclear weapons is revealed. Last modified: 2025-01-23 12:01

The article talks about what a natural community is. It talks about the various relationships between all elements of the community. Last modified: 2025-01-23 12:01

The discovery of nuclear fission began a new era - the "atomic age". The potential of its possible use and the ratio of risk to benefit from its use have not only generated many sociological, political, economic and scientific achievements, but also serious problems. Even from a purely scientific point of view, the process of nuclear fission has created a large number of puzzles and complications, and its full theoretical explanation is a matter of the future. Last modified: 2025-01-23 12:01

Robert Andrews Milliken, whose brief biography will be presented to your attention in the article, was born on March 22, 1868, in the city of Morrison, which is located in Illinois. His father, Silas Franklin Milliken, was a clergyman in the Congregational Church, his mother, Mary Jane Milliken, worked for a long time as dean of Olivet College, which is located in Michigan. Also, in addition to Robert, the family had two more boys and three girls. Last modified: 2025-01-23 12:01

What is amber, what physical and chemical properties does it have. What is the density of amber and what does it depend on. Other useful qualities of the mineral. Last modified: 2025-01-23 12:01

Bromine water is bromine diluted with water. It is customary to write it in the reaction equations through such a formula - Br2, although it is in solution in the form of a mixture of two acids - HBrO (hypotensive acid) and HBr (hydrobromic acid). This compound has a yellow-orange color and a fairly low freezing point. Is a strong oxidizing agent. Last modified: 2025-01-23 12:01

Root is the underground axial element of plants, which is the most important part of them, their main vegetative organ. The article discusses the types of roots and types of root systems, as well as their distinctive characteristics. Last modified: 2025-01-23 12:01

Ricinoleic acid: description of the substance, physical and chemical properties. Methods of obtaining and its derivatives. Application in the chemical, pharmaceutical and cosmetic industries. The effect of ricinoleic acid on living organisms. Last modified: 2025-01-23 12:01

Who are the boyars? This is the upper class that existed in Russia from the 10th to the 17th century. The privileged class also included the great and specific princes. Last modified: 2025-01-23 12:01

Bryophytes are also called true mosses or bryophytes. All species are combined into about 700 genera, which, in turn, make up about 120 families. Last modified: 2025-01-23 12:01

The structure of the epithelial tissue of humans and animals is primarily due to its localization. Epithelial tissue is the boundary layer of cells lining the integument of the body, mucous membranes of internal organs and cavities. Also, many glands in the body are formed precisely by the epithelium. Last modified: 2025-01-23 12:01

Neoclassical synthesis involves the study of the current aspect of the production process from various angles. Last modified: 2025-01-23 12:01

For many, chemistry lessons are a real torment. But if you understand it at least a little, then you can conduct entertaining experiments and enjoy it. Yes, and teachers will not hurt to interest their students. For this, the so-called pharaoh snakes are perfect. Last modified: 2025-01-23 12:01

Cold fusion can also be called cold fusion. Its essence lies in the possibility of realizing a nuclear fusion reaction occurring in any chemical systems. Last modified: 2025-01-23 12:01

A particle accelerator is a device that creates a beam of electrically charged atomic or subatomic particles moving at near-light speeds. The basis of his work is an increase in their energy by an electric field and a change in the trajectory by a magnetic. Last modified: 2025-01-23 12:01

Today, when children begin to receive environmental education in primary school, and environmental issues are not the last in the media, ecology is still a young, complex and mysterious science. Its scientific base is not so great, and complex models are intricate. Nevertheless, knowledge and understanding of the basic laws in this area is the basis of the worldview of a modern person. Last modified: 2025-01-23 12:01

When describing the development of living organisms, the terms "protostomes" and "deuterostomes" can often be found. These are all existing multicellular organisms, except for the coelenterates, which differ at the embryonic level. Last modified: 2025-01-23 12:01

What are the functions of the kidneys and what are they? The question is very interesting. We all know approximately what kind of body it is, but it is unlikely that the majority will be able to give an exact definition. Well, it’s worth fixing this and telling all the most basic and important about this organ. Last modified: 2025-01-23 12:01

Metals are used in many areas of our lives. They are used in industry, design, everyday life, jewelry, construction, and medicine. At the same time, malleability is one of the most important characteristics that determines the ability of metals to withstand processing. What does it depend on? How is it manifested? Let's find out. Last modified: 2025-01-23 12:01

The Denver and Paris systems of classification of hereditary material, widely used in the scientific community, are designed to unify and generalize ideas about the karyotype. A common approach is needed for the correct presentation and interpretation of the results of research in the field of genetics, karyosystematics, breeding. Last modified: 2025-01-23 12:01

Each living cell has a set of structures that enable it to demonstrate all the properties of a living organism. In order to function properly, the cell must receive enough nutrients, break them down and release energy, which is then used to support life processes. Last modified: 2025-06-01 07:06

Genetic (cytogenetic) species criterion, along with others, is used to distinguish elementary systematic groups, to analyze the state of a species. In this article, we will consider the characteristics of the criterion, as well as the difficulties that a researcher may encounter when applying it. Last modified: 2025-06-01 07:06

From the moment the cells were discovered to the state of the art in cell theory was formulated, more than 400 years have passed. For the first time the cell was investigated in 1665 by the naturalist from England Robert Hooke. Noticing cellular structures on a thin section of cork, he gave them the name of cells. Last modified: 2025-01-23 12:01

The principle of incomplete dominance was discovered much later than the patterns of inheritance by G. Mendel. This type of interaction of alleles implies the appearance of individuals with an intermediate trait that is different from the parental pure lines. Last modified: 2025-01-23 12:01

A significant part of the content of the cell nucleus is represented by thread-like DNA molecules of varying degrees of compaction in combination with proteins. These are euchromatin (decondensed DNA) and heterochromatin (densely packed pieces of DNA). Euchromatin plays an important role in the life of the cell. It reads the "instruction" for the assembly of ribonucleic acid (RNA), which becomes the basis for the synthesis of polypeptide molecules. Last modified: 2025-01-23 12:01

Histology of the respiratory system is one of the important sections of biology that allows you to understand the structural features of a living organism. Last modified: 2025-01-23 12:01

Aminocarboxylic acids (amino acids) are beads in the protein chain of any living organism. But few people know that almost all of them were discovered in the second half of the last century. The biogenic sulfur-containing amino acids of interest to us in this article are cysteine and methionine. Let's try to enrich the reader's knowledge of these two organic compounds from the point of view of biochemistry and biology of our he alth. Last modified: 2025-01-23 12:01

The food chain has a certain structure. It includes producers, consumers (of the first, second order, etc.) and decomposers. More about consumers will be discussed in the article. In order to thoroughly understand who the consumers of the 1st order, 2nd and beyond are, we first briefly consider the structure of the food chain. Last modified: 2025-01-23 12:01

Botany, like the names of many other sciences, has Greek roots. "Botany" - a derivative of the word "botane", it meant everything related to plants. Therefore, wondering why the science of plants is called botany, the answer must be sought in the Greek origins of the systematization of knowledge about the plant world in the form of science. Last modified: 2025-01-23 12:01

The surrounding world is an interconnected organism in which all processes and phenomena of animate and inanimate nature occur for a reason. Scientists have proven that even minor human interventions bring tremendous changes. What is evaporation? This is a phenomenon in which, in a certain phase, the transformation of a substance from a liquid into a vapor or gas occurs. The reverse effect of this process is called condensation. Last modified: 2025-01-23 12:01

Roman numeration is an example of a non-positional number system, we know it now. Also, the Roman system is actively used, but not for mathematical calculations, but for narrowly focused actions. For example, with the help of Roman numbers, it is customary to designate historical dates, centuries, numbers of volumes, sections and chapters in book publications. Last modified: 2025-01-23 12:01

The temporal muscle performs the most important functions: chewing and mimic. It often affects the occurrence of pain of various origins: headache, toothache. Measures are possible in which muscle clamps and pain points can be eliminated. Last modified: 2025-01-23 12:01

The Horsehead Nebula is one of the most famous objects in the sky. In pictures taken even with the use of amateur telescopes, it looks very impressive. What is this object and does it always look like in the usual photographs in the optical range?. Last modified: 2025-01-23 12:01

What is a ricochet? Where did this word come from? Interpretation of the meaning and examples of this phenomenon from everyday life await the reader in this article. Last modified: 2025-01-23 12:01

Petrified wood is a material formed from trees that grew in past geological epochs. The article discusses the features of education, properties and applications of this unique stone. Last modified: 2025-01-23 12:01

Nobel Alfred - an outstanding Swedish scientist, inventor of dynamite, academician, experimental chemist, Ph.D., academician, founder of the Nobel Prize, which made him world famous. Last modified: 2025-01-23 12:01

The Nobel Prize is known all over the world. But what exactly is its size and how it appeared, not everyone knows, although all this really deserves attention and interest. Last modified: 2025-01-23 12:01

Quantum teleportation is one of the most important protocols in quantum information. Based on the physical resource of entanglement, it serves as the main element of various information tasks and is an important component of quantum technologies, playing a key role in the further development of quantum computing, networks and communication. Last modified: 2025-01-23 12:01

The article describes what paradoxes are, gives examples of them and discusses their most common varieties. Last modified: 2025-01-23 12:01