In Princeton, New Jersey, there is a legendary tale about the eminent scientist Albert Einstein walking in front of a local inn and being mistaken for a bellboy by a dowager who had just arrived in a luxury sedan. She orders him to carry her luggage into the hotel, and, according to the story, Einstein does so, receives a small tip, and then continues on to his office to ponder the mysteries of the universe. True or not, the story is delightful, precisely because we savor from the beginning a secret…