WHAT IS AN ELECTRIC CURRENT?

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ЧТО ТАКОЕ ЭЛЕКТРИЧЕСКИЙ ТОК?

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The question is often asked: "What is an electric current?" No one has ever seen it. We only know of the existence of a current owing to its effects. A current can heat a conductor, it can have a chemical action when passing through a solution, or it can produce a magnetic effect. We can ... Читать дальше »

For more than four centuries telescopes have been the Earth's window on the universe. But the views they give have been limited by the size and shape of the instruments. Now scientists in many countries are developing bigger telescopes that will enable astronomers to look deeper into the corners of the universe. The main principle of a telescope is: the larger ... Читать дальше »

TEXT А. ВАМ — ARTERY OF LIFE

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ТЕКСТ А. ВАМ — АРТЕРИЯ ЖИЗНИ

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Mikhail Lomonosov, a famous Russian scientist, once said that the increase of Russia's power would come from Siberia. That these words said more than 200 years ago were true is quite evident today. Siberia is extremely rich in natural resources, and the potential of Siberian power generat ... Читать дальше »