Because I am interested in the growth and development of early hominids, I play with my kids, you know, looking at their teeth or measuring their heads, which they like also, because it's kind of fun.

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 learned that the first technology appeared in the form of stone tools, 2.6 million years ago. First entertainment comes evidence from flutes that are 35,000 years old. And evidence for first design comes 75,000 years old - beads. And you can do the same with your genes and track them back in time.

My family, in a way, gives me a reference as to who I am as an individual, and my work gives me a reference as to who I am as a Homo sapiens. I think that's a very perfect match, in my view.