Next to the discovery of the Turkana boy, the visit to Lascaux ranks as one of the great moments of my life. - Richard Leakey

The quality that accompanies the emergence of learning in the evolution of higher animals, namely intelligence, is surprisingly difficult to define.

Where Breuil has seen chaos—or at least, randomness—in wall art, Leroi-Gourhan sought and found order.

We are justified in calling all species of bipedal ape "human." ...the adaptation of bipedalism was so loaded with evolutionary potential—freeing the upper limbs to be free to become manipulative implements one day—that its importance should be recognized in our nomenclature. These humans were not like us, but without the bipedal adaptation they couldn't have become us.