Two hiking buddies came upon an old, infirm man at a riverside. One of them shoulder-carried the invalid to the other side. Whereupon the buddies went on their way. Several miles later the second buddy said to the carrier, “I wonder what’s happened to the old man.” “I don’t know,”said the first. “You’re wearing yourself out thinking about it. I put him down several miles ago.” Altruism won’t benefit you even if your name is *Al.*