"If you attend a meeting of evolutionary biologists somewhere in America, you might be lucky and spot a tall, gray-whiskered, smiling man bearing a striking resemblance to Abraham Lincoln, standing rather diffidently at the back of the crowd. He will probably be surrounded by a knot of admirers, hanging on his every word--for he is a man of few words. A whisper will go around the room: "George is here." You will sense from people's reactions the presence of greatness."