“If the molecular evidence is correct… almost five million years passed between the time our ancestors became bipedal and the time when they started making stone tools. Whatever the evolutionary force that produced a bipedal ape, it was not linked with the ability to make and use tools. However, many anthropologists believe that the advent of technology 2.5 million years ago did coincide with the beginnings of brain expansion.”

The Origin of Humankind (1994)

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Richard Leakey39

Kenyan paleoanthropologist, conservationist, and politician 1944

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“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.”

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“If the Darwinian package were correct, then we would expect to see the simultaneous appearance in the archeological and fossil records of evidence for bipedality, technology and increased brain size. We don't.”

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Context: And that was a million years ago
In a time that no man knows;
Yet here tonight in the mellow light
We sit at Delmonico's.
Your eyes are deep as the Devon springs,
Your hair is dark as jet,
Your years are few, your life is new,
Your soul untried, and yet