Indispensable for understanding modern physics (General Relativity and Quantum Mechanics), where it comes from (Democritus, Newton, etc.) and where it goes (quantum gravity). It is unfortunate, however, that the author is about to be served by poor translation or by a too imprecise expression (use of demonstrative pronouns which one knows exactly which element of the preceding sentence they refer) at key moments (see "Still Albert") who lose the thread of reasoning.
