"Lucy" Discoverer Donald C. Johanson - TIME: "Here's a zinger: what makes us human?
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 up right. That's all. If you go to 2.6 million years ago, it's the fact that we're designing and making stone tools. And at 2 million years ago what makes human is our large brains that are at least two and half times the size of a chimp's. At twenty thousand years ago, what makes us human is the ability to make beautiful cave art. It's all relational. And if you look at us today, I wonder if we are human."
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