Is it true , that aliens come to Earth on their spaceships - "flying saucers"? Is it true, that in the distant past they have already been on our planet and our ancestors took them for gods? Can some people really predict the future? Is it true, The souls of their inhabitants wander in the ancient castles ,. died several centuries ago? Is it true, In this book we will try to answer all these questions. There is something in common with them: these questions cannot be given clear, unambiguous answers .. Many people unconditionally believe in fortune-tellers and astrologers, believe in UFOs and ghosts, in any mysterious phenomena, and scientists are quite skeptical about all this. Yes, we often hear about the most incredible incidents, and scientists are unsuccessfully trying to scientifically explain or confirm them, finally, in this field, associated with the incomprehensible, mysterious, many charlatans and fraudsters struggle. "What Is What" is a series of thematic encyclopedias published from 1994 to 2001 by the publishing house "Word" and aimed at school-age children. Initially, it was translated materials of a similar German series "Was ist was", but later, as part of the series, the publishing house began to produce works by domestic authors. The abundance of illustrations, fascination, diversity and accessibility of the presentation of the material predetermined the great popularity of the series. "What is What" easy reading - serious knowledge!Other books in the series "What is What":Byzantine Wolves of Heaven. Flags Calendar. Caves of the Cat. Time. Dolls. Butterflies Sculpture. Our Body . Ancient Greeks Ancient myths Myths of Slavs Sun Apes Ancient China . Painting Orbital Stations . Underwater exploration of the Earth Planet Ancient Greece. Trees. Forest. Poisonous plants . Money from Russia . Multimedia and virtual worlds Natural Disasters Mountains Pyramids Museums Travelers . Crusaders Weather. Bees, Bumblebees, Wasps Moors Elephants Fish Birds Ships Gladiators Samurai. Pirates. Water. Bridges . Geographic Maps of the Witch Star. Internet Seven Wonders of the World Predators Nuclear Power Arctic and Antarctic. Indians Horses Dinosaurs Ancient Russia . Moscow Rus Revival . Mysterious Treasure Phenomena . Tropical Forest