Man and Car! Living organism and mechanism! Is it possible to try to find general patterns to which the control processes in a living organism and a machine made by a human hand are subordinated? To tell about this, a book was conceived about cybernetics - an exciting new science, the possibilities of which are difficult to outline boundaries. The very first attempt showed that, talking about cybernetics, it is impossible to bypass computing technology in silence. Cybernetics owes its development to her. And I had to write about computers. The book is not written for fun and not just to introduce the reader to amazing machines and new science. We would like you to think a little about the things that you will meet here.