An American scientist once visited the offices of the great Nobel Prize-winning physicist, Neils Bohr, in Copenhagen. The American was amazed to find Neil nailed a horseshoe to the wall over his desk.
The American said with a nervous laugh, “Surely you don’t believe that horseshoe will bring you good luck, do you, Professor Bohr?”
Bohr chuckled. “I believe no such thing, my good friend. Not at all! I am scarcely likely to believe in such foolish nonsense. However, my friend told me that a horseshoe will bring me good luck whether I believe in it or not! How can one argue with such logic?”