The story is told about Albert Einstein, the brilliant physicist of Princeton University in the early 20th century. Einstein was traveling from Princeton on a train, and when the conductor came down the aisle to punch the passengers’ tickets, Einstein couldn’t find his. He looked in his vest pocket, he looked in his pants pocket, he looked in his briefcase, but there was no ticket. The conductor was gracious; “Not to worry, Dr. Einstein, I know who you are, we all know who yo…