Edward Drinker Cope was a charming man with a passion for old bones. Othniel Marsh was a stickler for procedure when he studied his fossil finds. They started as friends, sharing ideas and information, but after Marsh tried to poach Cope's digging site, they became bitter enemies. Their decades-long feud fueled their desire to dig up more bones, to discover new species, and to find ever bigger and more unusual dinosaurs. Through their competition,...