Each of us wants to see our children educated, erudite and observant. But for some reason, even adults sometimes do not remember that animals and animals are not the same thing as fish and birds are also animals, and cucumber is a herbaceous plant. Not everyone knows about the planets of the solar system and black holes, that table salt on the dining table is sodium chloride, and living organisms necessarily contain chemical elements. These and other gaps will help fill the authors of this wonderful book - Natalia Ivanova and Natalia Kapustyuk.