"What I want to do today is talk about some ideas I've been exploring concerning the origin of human kindness. And I'll begin with a story that Sarah Hrdy tells at the beginning of her excellent new book, "Mothers And Others." She describes herself flying on an airplane. It’s a crowded airplane, and she's flying coach. She's waits in line to get to her seat; later in the flight, food is going around, but she's not the first person to be served; other people are getting their meals ahead of her. And there's a crying baby. The mother's soothing the baby, the person next to them is trying to hide his annoyance, other people are coo-cooing the baby, and so on."