Suppose I went out sailing with my daughter and a young chimp, and the boat capsized and I had the chance to save one of you but not both—you wouldn’t expect me to save the chimp, would you?” “I sometimes think so,” said Mom, meaning to make a joke of it but getting it wrong. “Nonsense. It would be no choice at all. That was effectively the same decision we had to make about you. And then if I can make it in your case, what right have I to withhold a similar chance from someone else? Suppose I were in my boat with a chimp and a stranger’s child ...”
