On a train journey in the American Midwest, Schweitzer was approached by two ladies. “Have we the honor of speaking to Professor Einstein?” they asked. “No, unfortunately not,” replied Schweitzer, “though I can quite understand your mistake, for he has the same kind of hair as I have.” He paused to rumple his hair. “But inside, my head is altogether different. However, he is a very old friend of mine—would you like me to give you his autograph?” Taking a slip of paper from his pocket he wrote: “Albert Einstein, by way of his friend, Albert Schweitzer.”
