By Laurie Santos from TED Talks Science of Virtues Scholar Laurie Santos looks for the roots of human irrationality by watching the way our primate relatives make decisions. A clever series of experiments in "monkeynomics" shows that some of the silly choices we make, monkeys make too. See...

By William Saletan | Slate "Is it OK to impregnate a 60-year-old woman? Should old women have babies? Until recently, this wasn't an issue. Nature exhausted your egg supply, and that was it. But technology has surmounted that problem. Now you can get in vitro fertilization, donor eggs, and womb...