The book brought to your attention is not a reference book or a textbook, and its main task is not so much to inform you about a wide variety of facts, but to arouse interest in a particular area of knowledge and human activity. Addressed to both schoolchildren and those who have long left school age, it provides a unique opportunity to discover our world in all its amazing diversity. If you are curious and eager to discover new things, then the questions and answers collected here will allow you to see the limitless power of the human mind.