I had heard much about Richard Feynman's legendary teaching ability. The introduction, and "special preface" in this book fuel the hype. Feynman's own preface is humble and folksy. The anticipation builds.  Then the physics begins...<br><br>I was disappointed. Maybe Feynman was groundbreaking in the 1960s, but his style and analogies are now widely copied and he is no longer original. The second problem is that these are not normal books, but lectures presented by Feynman (orally, with time constraints) in the 1960s, that have been posthumously published in book format.<br><br>This is not a bad introduction to Relativity and quantum physics, but it is not the best account that I have ever read. Were it not for the hype, I might have had a more favourable impression, although, without the hype, it's unlikely that I would have chosen a 40 year old introduction to Relativity.<br><br>If you want to learn about Relativity, then you will need to read a few different accounts anyway. No reason why this shouldn't be one of the first.