Dmitry Ivanovich Mendeleev - Creator of the Periodic System of Chemical Elements

The author of the article addresses significant milestones in the life path of Dmitry Ivanovich Mendeleev, gives the statement of the historian of science, academician B.M. Kedrova, characterizing the personality of the creator of the Periodic system of chemical elements.

Chemical element Arsenic

The article describes the chemical element As, presents its physical properties and a number of areas of application.

Some features of the architecture of St. Basil's Cathedral

The work presents a number of features of a remarkable architectural monument - St. Basil's Cathedral. The author of the article gives a description of the temple given by Academician D.S. Likhachev, and his own impressions of visiting the Cathedral.

What is fire?

The definition of fire is given in the work, factors necessary for its occurrence and existence are indicated, attention is paid to the fire safety problem.