I love Mary Roach and gave her other 2 books 5 stars: Gulp & Stiff. This one, which I was pretty excited to read (no pun here), was tedious. I didn't learn anything of particular interest...as I did in her other 2 books...and got tired of the limited theme. I think it could have been ½ as long and, maybe, I could have eeked out another star. Disappointing.