Book excerpt: A cross between a human and a bonobo? Carl Sagan and others have speculated: Is it possible? What kind of creature would it be? And how might this affect our world? Kelpie Wilson takes the premise and runs with it in this engaging novel. Primal Tears is the story of Sage, born to a young woman who has volunteered to be a surrogate mother for an endangered species of chimpanzee. The process goes awry, and Sage, a lovable youngster, is neither completely one species nor the other. When her existence becomes public knowledge, she needs all the best characteristics of both species to find a place for herself in our human-dominated world.