Why is crunchy food so appealing? Why is it so hard to find words for flavors and smells? Why doesn’t the stomach digest itself? How much can you eat before your stomach bursts? Author Mary Roach, dubbed “America’s funniest science writer” by the Washington Post, answers these and many more questions in her new book, Gulp: ADVENTURES ON THE ALIMENTARY CANAL. Mary Roach talks about the many wondrous things that happen to food, from when it goes in, to when it comes out.