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From top: man (with dropped spear) and bison, Lascaux, France, Upper Paleolithic; Hunter, Attic black-figure lip cup, Greece, 6th century B.C.; New York Mets Hall of Famer Tom Seaver, 1973(Private Collection/J.T. Vintage/The Bridgeman Art Library, Werner Forman/Art Resource, NY, Pat Benic/Copyright Bettmann/Corbis/AP Images)
During the several-million-year journey our ancestors made from climbing trees to living their lives primarily on the ground, they evolved two traits that would ensure th
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