What subjects belong to natural sciences?, geography, history, chemistry, botany, mathematics, biology, What subjects belong to social sciences?, politics, psychology, physics, biology, Mendeleev created, Table of chemical elements, table of physical elements, poem "Fathers and Sons", Albert Einstein worked on..., The Big Bang Theory, theory of relativity, Theory of mass and force, When was the television invented?, 1980, 1940, 1926, What was the first country in the world to send a `satellite into space?, the USA, the USSR, France, When did the Internet appear in Russia?, 1975, 2000, 1990, In what century was the telephone invented?, 19, 20, 21

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