But what really excited me was the idea that humans had a tremendous pre-history that went back millions of years. I wanted to go to Africa to find some of these creatures.

And what I wanted to do was, I wanted to explore problems and areas where we didn't have answers. In fact, where we didn't even know the right questions to ask.

One has to devote oneself to a particular pursuit. To be successful at anything, you have to make a total commitment to it.

Most Achievers I Know Are People Who Have Made A Strong And Deep Dedication to Pursuing A Particular Goal. That Dedication Took A Tremendous Amount Of Effort.

Normally, we are happy to find a fragment of jaw, a few isolated teeth, a bit of an arm, a bit of a skull. But to find associated body parts is extremely rare.

Scientists are very afraid of being proven wrong.

Lucy brought with her an image of our human ancestors that you don't get when you find a jaw or an arm bone or a leg bone. Here was 40 percent of a single skeleton.