Two brilliant scientists turned bitter enemies in the most destructive feud in scientific history. From dynamiting fossil sites to bribing workers and publicly humiliating each other in academic journals, Cope and Marsh's obsession with destroying one another came at the cost of their reputations, fortunes, and sanity—but gave us many of the dinosaurs we know today. This is the story of how personal hatred fueled the greatest fossil-hunting race America has ever seen.