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Shadows of Forgotten Ancestors Carl Sagan Ballantine Publishing Group 1993 Paperback Used; Very Good. Scuff on back and normal shelf wear. Non-Fiction 6x9.25x1 Sagan's goal is to explain how luck and natural selection combined to produce human beings after three and a half billion years of life on earth. Human behavior, he stresses, results more from similarities with our animal ancestors than from any unique qualities we may possess. Price: 8.00 USD
