to intercede have tended to find little consensus or traction. Science gets some. I tipped my hand on my own views in Chapter 1. As chairman of the Leakey Foundation for more than 40 years, | pretty clearly buy evolution theory and unguided natural casualty as working assumptions. But I invite those who

onary biology and Hamilton’s rule. Both were new to me. Irv was a champion speaker. Students packed his anthropology classes at Harvard. He became a Leakey stalwart and a particularly close friend. I liked his topic. Genes code for traits, and traits more adaptive to niche pressures are likelier to carr