At age three, if you have a still-growing brain, it's a human behavior. In chimps, by age three, the brain is formed over 90 percent. That's why they can cope with their environment very easily after birth - faster than us, anyway. But in humans, we continue to grow our brains. That's why we need care from our parents.

I was going to France to do my masters and my Ph.D., but I didn't know how to say, 'bonjour.' You really feel like a baby, starting everything from scratch.

I went to start the first Ethiopian-led project in paleoanthropology, ever. Doing that was not easy.

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