We do not think to life without электроприборов, does not part with a mobile telephone, conduct whole days at the computer, use the objects made out of different materials. And do many of us know how is all of it arranged? How does a current go on wires, from what do a plastic, that twists the wheels of machines, how an image is passed on television? A book "Scitech" will tell to you about a device much of that surrounds us. Step by step passing all history of development of scientific and technical thought of humanity, an even unprepared reader will understand easily, as a laser works, what digital technologies and why companions do not fall from an orbit. Numerous charts and pictures will help evidently to present a device and principle of work of different mechanisms.This book will be useful for schoolchildren in mastering of physics, chemistry, mathematics, informatics, biology.