I used to rent a house in Princeton, New Jersey, and whenever people came to visit me, I would drive them past Albert Einstein's house, which is the most ordinary house in Princeton - a house, let me assure you, that now a salesman wouldn't live in. I'd always say, "That was Albert Einstein's house." And they'd say, "What do you mean? Why would Albert Einstein live in a little house like that?" And I'd always say to people, "Because he didn't care!"