Albert Einstein wrote: “How is it that mathematics, a product of human thought, independent of experience, correlates so perfectly with the objects of physical reality?” Science proposes an abstract mathematical model, and after some time (sometimes decades) it turns out that this model exists in reality! So who invented mathematics - ourselves or the Universe? Maybe mathematics is the language in which the universe speaks to us? The brilliant physicist and witty writer Mario Livio talks about mathematical ideas from Pythagoras to the present day and shows how abstract formulas and inferences have helped us describe the Universe and its laws. The book is addressed to all the curious readers regardless of age and education.