We are placed in the genus of Homo, which is Latin for man - Homo sapiens: supposedly wise men. I sometimes think - wonder - whether we really are wise men.

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.

This was the most important discovery I had ever made in my life. It was a discovery which has irrevocably changed my whole life's direction. It immediately elevated me to the status of one of the world's leading anthropologists.

In our case, finding a Lucy is unique. No one will ever find another Lucy. You can't order one from a biological supply house. It's a unique discovery, a unique specimen.

I'm one of the slowest drivers on the road. I mosey along. If you're doing anything too fast, including living life too fast, that creates sudden death. If I have to be somewhere on time, I make sure I leave early enough.

The public has heard the stereotypical love songs a million times, and they've heard the stereotypical life-or-death songs millions of times. It's good to mix it up a little bit.

I am interested in struggle - between our hearts and our head, between principle and desire - and one of those struggles is with mortality; and no one at all is immune to it, which makes it even more interesting to me. Some people fall in love, some don't. Some sky dive, some don't. Everyone who lives, ages.

As any successful mad scientist will tell you, energy ain't free. Popular culture tends to forget this, instead focusing on the destructive capabilities of our finely crafted death rays without noting the massive energy expenditures required to use them.