Alfred Russel Wallace, a contemporary of Charles Darwin, independently proposed a theory of natural selection in 1858 which prompted Charles Darwin to publish on his own theory. In his fall Stegner Lecture on November 5, 2008, David Quammen, prolific writer and current Wallace Stegner Endowed Chair in Western Studies at MSU, discusses this lesser known naturalist, evolutionist, geographer, anthropologist, social critic and theorist. (52 minutes)

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