Donald Johanson quoteDonald Johanson [1943-0]
American Scientist 
Quote rank: 115
| What makes us human depends on what place on our evolutionary path we're talking about. If you go back six million years ago, what makes us human is that we were walking upright. That's all. If you go to 2.6 million years ago, it's the fact that we're designing and making stone tools. |
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