Carroll is a fluent lecturer, very personable, and very knowledgeable (and a snappy dresser for a Great Courses professor), but this course is badly organized. After 24 lessons, I feel like I heard the same things repeated a dozen times, and at the end, the main point of the videos, why is there an arrow of time, doesn't seem much better explained than it was several videos earlier. There are all sorts of interesting digressions along the way, into things like neuroscience, and as I said, Carroll is so likable and such a good presenter that I kept watching, but this material could have been easily presented in half the time, and it would have become more understandable in the process. ( )