Imagine making your living by hunting, fishing, and collecting wild plants and insects. Imagine having to worry about being attacked by a jaguar or some other wild animal. This is how our ancestors lived for hundreds of thousands of years, but only a few peoples carry on this ancient lifestyle today. One of the few are the Ache, hunter-gatherers living in Paraguay, a country in South America. Magdalena Hurtado is an anthropologist who has been studying...