There is something rather odd about this book on cosmic inflation. Will Kinney assumes a considerable amount of foreknowledge in the reader - for example, he uses electron volts as a unit of energy without unpacking the concept and throws in everything from 'the unification of strong and electroweak forces' to 'the Hawking radiation of black holes' as if these are topics with which the reader will be comfortably familiar, no explanation needed. The problem with this is, if you know that much, you are probably pretty clued in on the basics of cosmic inflation too, so I'm not sure who the target reader of this book is. This is not helped by a series of light cone-based diagrams that convey nothing much at all. Inflation is a strange subject. It's a patch to fix the Big Bang theory so it can cope with the way that the universe is unexpectedly homogenous and flat (in the sense of (not) curved space), a patch that has limited evidence to back it up. Kinney emphasises...