I really liked this book. Mr. Bryson has a writing style that makes science enjoyable and accessible. I highly recommend it to anyone who has even a passing interest in the world around us.
There were a few places where the science was just too extreme to explain to my poor brain. String theory, wherein the string exists in eleven dimensions was one of them. Eleven dimensions! Crazy.
There were also a few places where people were quoted by name, but I couldn't remember when we had been introduced to them. This may be my own fault, as names are not my strong suit, and there were TONS of them in this book.
The ordering was fairly smooth early on, but closer to the end of the book, it tended to jump back and forth between the 1800s, 1900s, and 2000s to keep with the discoveries as they happened. The dates became a blur at this point.