Translated from Russian by Vitaly KisinThis little book concentrates on the foundations of modern physics (its 'ABC's') and its most fundamental constants: c — the velocity of light and ℏ — the quantum of action.First of all, the book is addressed to professional physicists, but in order to achieve maximal concentration and clarity it uses the simplest (high school) mathematics. As a result many pages of the book will be useful to college students and may appeal to a more general audience.

Translated by: Vitaly I Kisin