There is an old story about Albert Einstein. He was going around the country from university to university on the lecture circuit, giving lectures on his theory of relativity. He traveled by chauffeur-driven limousines.

One day, after they had been on the road for a while, Einstein’s chauffeur said to him, “Dr. Einstein, I’ve heard you deliver that lecture on relativity so many times that I’ll bet that I could deliver it myself.”

“Very well,” the good Doctor responded, “I’ll give you that opportunity tonight. The people at the university where I am to lecture have never seen me. Before we get there, I’ll put on your cap and uniform and you will introduce me as your chauffeur, and yourself as me. Then you can give the lecture.”

For awhile that evening, everything went according to plan. …