Everyone knows that Einstein's special relativity is a theory of time and space measurements, no longer considered absolute. But many who have tried to study it have not been able to understand it: yet it is enough to know what speed and square root are. This book, written for beginners and for perplexed who have tried the study of relativity without success, leads its readers to understand this founding idea of twentieth century culture and to judge it with their own intelligence.

This book is aimed at people who simply know the basics of computer programming. It does not require any notion of physics and allows its readers to understand with total accuracy the use that could be made of a quantum computer, by explaining how to write a software to emulate its operation. The resulting knowledge is of vital importance to investors too, because it allows them to judge independently on the risk of investing in this technology.

There is no greater satisfaction than breaking the veil of age-old naivety with which we consider the things around us, and looking at the world again with the experience of having read the Critique of Pure Reason. This guide is designed to be together with Kant's text because it consists of short comments specifically referring to the paragraphs of the Critique which need explanation, comments that translate Kant's words into clear and familiar language for today's readers.