This book contains answers to questions from various fields of knowledge. After reading it, you will understand why fish do not drown and how a nuclear power plant works, how a gyro scooter differs from a segway and what awaits the universe in the future. An intelligible presentation, accompanied by detailed diagrams, and colorful illustrations will turn the most difficult topics into simple and accessible, and the interesting facts presented in the mini-encyclopedia will make the reading process incredibly exciting. This publication will take a worthy place both in the library of a young scholar and on the bookshelf of an adult reader. The book is addressed to curious teenagers and their caring parents.