My first gripe is that it contains very little chemistry (the best science!) More importantly, the chapters vary from really easy, 11-year-old level science, up to ridiculously difficult concepts to grasp in 10 short pages. I still have no idea what it was on about with the 11 dimensions of string theory for one. My final issue with this book is the fact that it repeats itself many times. Perhaps some of the chapters could have been merged and made slightly longer?