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University of Tennessee Professor Gordon Burghardt talks to his wife by cellphone while depicting 19th century naturalist Charles Darwin during a bicentennial celebration of Darwin's birth on Thursday, Feb. 12, 2009 in Knoxville, Tenn. The school's 13th annual Darwin Day featured lectures and films about evolution and its importance as biology's unifying concept. (AP Photo/Michael Patrick, Knoxville News Sentinel)

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