msiegel Star
From the page: "...the genetic relatedness concept stems from the late Bill Hamilton of Oxford University, one of the greatest evolutionary biologists of the 20th century. Prior to Hamilton, the British geneticist J. B. S Haldane also hit upon the idea in a famous anecdote. When asked by a friend at a pub whether he would risk his life to save a drowning man, Haldane scribbled some notes on a napkin and answered, "No, but I would do it for two brothers or eight cousins." "