Fluorine is the most active and most aggressive chemical element in nature. Until recently, destructive properties made it impossible to use it for the needs of mankind. But now the chemists have won. Fluoride is defeated and put in the service of atomic and jet technology, aviation and astronautics, science and industry. This book is a story about the history of the conquest of fluoride, full of failures, tragic incidents and victories, a story about its compounds with inorganic and organic substances and their truly extraordinary properties.