Mammoth Bones and Broken Stones is the story of how and when people came to North America. I found it interesting the level of debate about how early people came to the Americas. Some scientists think the Clovis people came first, others say there were people even earlier than that. Maybe they crossed the land bridge or came by boat. Maybe they caused the extinction of large North American mammals or they just happened to be there then. Great illustrations and maps. Very informative.