Fascinating book. Waugh was able to take a complex, fairly dry subject and present it as entertaining, as well as informative. The one thing that disappointed me though was the lack of women present in the text. Yeah yeah, I know about women's historic role in the Church and in science, but I feel there were some real missed opportunities to have said, "Maybe a man didn't do this." A perfect example would have been for the chapter entitled "Menses" (for God's sake). The Ishango bone was a tool from the Upper Paleolithic era; it's characterized by tally marks in three columns. It's not really known exactly what it was used for, but take this quote from Claudia Zaslavsky: "Originally described as a record of prime numbers and doubling, Alexander Marshack later concluded, that it represented a six-month lunar calendar. The dating of the Ishango bone has been reevaluated, from about 8000 B.C.to perhaps 20,000 B.C. or earlier. Similar calendar bones, dating back as much as 30,000 years, have been found in Europe. Thus far the oldest such incised bone, discovered in southern Africa and having 29 incisions, goes back about 37,000 years. Now, who but a woman keeping track of her cycles would need a lunar calendar? When I raised this question with a colleague having similar mathematical interests, he suggested that early agriculturalists might have kept such records. However, he was quick to add that women were probably the first agriculturalists." It just feels like a huge missed opportunity not to include this. Perhaps Waugh will publish a revised edition one of these days.