This book is 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 strive to discover new things, then the questions and answers collected here will allow you to see the limitless power of the human mind. The book offered 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 as to arouse interest in a particular field of knowledge and human activity.