Poses more questions than answers. Talks in circles. Really has nothing to do with the history of time and instead just recaps several theories about the universe. There are a couple of interesting chapters on black holes. But this is more about space than time, though in some ways I guess he purports they are one and the same. Be sure to read the appendix because he changed later some theories from the book. Overall the writing and diagrams are not super well explained for a lay audience and I've read many far better books on space, time, and quantum physics.