"I was being groomed as an undergraduate to specialize in Midwestern prehistory, but going back to my..." — Donald Johanson

You don't just magically flip some evolutionary switch somewhere and transmute a quadruped into an upright-walking bipedal human.

Regardless of what we look like on the outside, genetically, on the inside, everyone is an African.

I find a tremendous receptivity among the public for the subject matter of, 'Where did we come from and how did we get here?' People are thirsty and hungry for information on our origins. I feel a responsibility as a major figure in the area... to convey to the public the knowledge of human origins in a way that is understandable to them.

It's very hard for all of us, when we've committed ourselves to a particular interpretation, to change our minds.