grunt • n. informal a low-ranking soldierAt a converted movie studio amputee actors prepare army medics for the shock and gore of combat wounds, while at a base in East Africa diarrhoea threatens national security. Beyond weapons and strategy, this is about the other side of war — how scientists protect soldiers from panic, exhaustion, heat and noise.Setting about her task with infectious enthusiasm, the incomparable Mary Roach sniffs archival World War II stink bombs, tests earplugs in a simulated war zone with the Marine Corps and burns the midnight oil with the sleep-deprived crew of a nuclear submarine. Speaking to the scientists and the soldiers, she learns about everything from life-changing medical procedures such as testicular transplants to more esoteric innovations like firing dead chickens at fighter jets. Engrossing, insightful and laugh-out-loud funny, Grunt is an irresistible ride to the wilder shores of modern military life.