No wonder they say that ideas are in the air. How else to explain the fact that scientists living in different parts of the Earth come to the same discovery? Pythagoras' theorem is perhaps a classic example of such "unanimity." In one form or another, this mathematical statement is present in almost all ancient cultures. This fact makes us doubt that the authorship of the idea belongs exclusively to the ancient Greek mathematician. But, be that as it may, one of the most famous theorems in the world is inextricably linked with the name of Pythagoras...