Mary Roach is one of my favorite nonfiction writers. Not only are the subjects she chooses to write about fascinating, but her writing style is both humorous and educational. She takes topics that most people don’t think about or want to think about, like dead people and digestion, and makes you want to learn more. I am always amazed at the people she finds to interview, the resources she uses and the topics she chooses to discuss. Gulp is all about our digestive system from one end to the other. Your average person doesn’t really want to know that much about the processes of the alimentary canal. As long as things are working properly we are ok in our ignorance. Not Mary; she wants all the dirty little details and she wants to share them with us. After reading several of her books I really do believe poop might be one of her favorite subjects since she incorporates mention of it in a lot of her books. I learned many things in this book: cows chew a mouthful of food up to 40 times; rats and rabbits eat their poop to get needed nutrients and without it their growth will be stunted; Elvis died due to an enlarged colon and constipation. Seriously! There is a disease that causes your colon to not push things through which causes it to be enlarged and you to have constipation. There are documented cases of 28 inch colons (average is 3 inches or so). Elvis could change waist sizes by several inches depending on whether he had gone to the bathroom that week. While these things might seem like stories you would read in the National Enquirer, Roach backs them all up with research studies and interviews of scientists. I will definitely continue reading everything she chooses to study as I haven’t found a clunker yet.