This book will introduce you to the ideas of Aristotle, one of the most profound and influential scientists and philosophers in history, the “father” of all subsequent philosophical traditions. The famous popularizer of science, Mortimer Adler, in the pages of this book once again demonstrates to us that real philosophy can be very useful in the real world. The book is written so simply that anyone can understand it - and not only understand it, but also get great pleasure from reading it. Here you will not find lengthy discussions: all the chapters are interconnected and together allow you to form an understanding of the ideas of Aristotle and philosophy in general. This is a book for everyone who is interested in philosophy and would like to get acquainted with the ideas of the great thinker in an accessible and interesting form. Published in Russian for the first time.