Mary Roach is one of my fave science writers. She's written Bonk (about sex), Stiff (about cadavers and what happens to them) and a few entertaining others. This book Gulp is about the alimentary canal and how it works. Actually I read the book to find out exactly how Elvis Presley died (and found out!) Essentially we are a large worm, that grew arms, legs and a brain so the worm would have an easier time getting food to live. That's pretty simplistic, but the book has many odd bits of entertaining stuff in it - how about the man with a colon that measured 28" around (not lengthwise) - yes twenty eight - it's in a museum. If you are curious and like the interesting/weird stuff of life this is the book for you.