The humorous science writer offers a tour of the human digestive system, explaining why the stomach doesn't digest itself and whether constipation can kill you.

A New York Times / National Bestseller "America's funniest science writer" (Washington Post) Mary Roach explores the science of keeping human beings intact, awake, sane, uninfected, and uninfested in the bizarre and extreme circumstances of war. Grunt tackles the science behind some of a soldier's most challenging adversaries—panic, exhaustion, heat, noise—and introduces us to the scientists who seek to conquer them. Mary Roach dodges hostile fire with the U.S. Marine Corps Paintball Team as part of a study on hearing loss and survivability in combat. She visits the fashion design studio of U.S. Army Natick Labs and learns why a zipper is a problem for a sniper. She visits a repurposed movie studio where amputee actors help prepare Marine Corps medics for the shock and gore of combat wounds. At Camp Lemmonier, Djibouti, in east Africa, we learn how diarrhea can be a threat to national security. Roach samples caffeinated meat, sniffs an archival sample of a World War II stink bomb, and stays up all night with the crew tending the missiles on the nuclear submarine USS Tennessee. She answers questions not found in any other book on the military: Why is DARPA interested in ducks? How is a wedding gown like a bomb suit? Why are shrimp more dangerous to sailors than sharks? Take a tour of duty with Roach, and you’ll never see our nation’s defenders in the same way again.

A look inside the world of forensics examines the use of human cadavers in a wide range of endeavors, including research into new surgical procedures, space exploration, and a Tennessee human decay research facility.

“America’s funniest science writer” (Washington Post) asks the questions children ask in this young readers adaptation of her best-selling Packing for Mars. What is it like to float weightlessly in the air? What happens if you vomit in your helmet during a spacewalk? How do astronauts go to the bathroom? Is it true that they don’t shower? Can farts really be deadly in space? Best-selling Mary Roach has the answers. In this whip-smart, funny, and informative young readers adaptation of her best-selling Packing for Mars, Roach guides us through the irresistibly strange, frequently gross, and awe-inspiring realm of space travel and life without gravity. From flying on NASA’s Weightless Wonder to eating space food, Packing for Mars for Kids is chock-full of firs-hand experiences and thorough research. Roach has crafted an authoritative and accessible book that is perfectly pitched to inquiring middle grade readers.

From acclaimed, New York Times best-selling author Mary Roach comes the complete collection of her “My Planet” articles published in Reader’s Digest. She was a hit columnist in the magazine, and this book features the articles she wrote in that time. Insightful and hilarious, Mary explores the ins and outs of the modern world: marriage, friends, family, food, technology, customer service, dental floss, and ants—she leaves no element of the American experience unchecked for its inherent paradoxes, pleasures, and foibles. On Cleanliness: Ed has crud vision, and I don’t. I don’t notice filth. Ed sees it everywhere. I am reasonably convinced that Ed can actually see bacteria. . . . He confessed he didn’t like me using his bathrobe because I’d wear it while sitting on the toilet. “It’s not like it goes in the water,” I protested, though if you counted the sash as part of the robe, this wasn’t strictly true. On the Internet: The Internet is a boon for hypochondriacs like me. Right now, for instance, I’m feeling a shooting pain on the side of my neck. A Web search produces five matches, the first three for a condition called Arnold-Chiari Malformation. While my husband, Ed, reads over my shoulder, I recite symptoms from the list. “‘General clumsiness’ and ‘general imbalance,’” I say, as though announcing arrivals at the Marine Corps Ball. “‘Difficulty driving,’ ‘lack of taste,’ ‘difficulty feeling feet on ground.’” “Those aren’t symptoms,” says Ed. “Those are your character flaws.” On Fashion: My husband recently made me try on a bikini. A bikini is not so much a garment as a cloth-based reminder that your parts have been migrating all these years. My waist, I realized that day in the dressing room, has completely disappeared beneath my rib cage, which now rests directly on my hips. I’m exhibiting continental drift in reverse. On Eating Healthy: So Ed and I were eating a lot of vegetables. Vegetables on pasta, vegetables on rice. This was extremely healthy, until you got to the part where Ed and I are found in the kitchen at 10 p.m., feeding on Froot Loops and tubes of cookie dough.