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Gr 9 Up—Adapted for younger audiences by the redoubtable Stefoff but not significantly different in scope, arguments, or, for that matter, reading level from Diamond's original (Harper, 1992, 2006), this wide-ranging study of what makes us human offers provocative views of evolution, adaptation, cultural diffusion, sexuality, genocide, race, mass extinctions of the past and present, the roots of drug abuse and language, and even the search for extraterrestrial intelligence ("we're alone in a crowded universe...