Excellent!!!<br>Dr. Green gives a brief introduction into the history of physics of the last century or so including great introduction to the laws of Relativity (both Special and General) and Quantum Mechanics. And then - on to the latest: the String Theory. It includes the major problems in physics and how they were resolved  by one or another theory (sometimes creating new problems).<br>All this is done from the viewpoint not of a journalist, but of a scientist - an actual contributor to some of the major discoveries.<br>What I found the most amazing is that all these extremely complicated issues are explained using not formulas, but pictures and analogies that are put together in such a way that anyone can read it and get the conceptual understanding of the basic facts (deeper understanding would, of course, require serious math background).