An American scientist once visited the offices of the great
Nobel Prize-winning physicist, Neils Bohr, in Copenhagen,
and was amazed to find that over his desk a horseshoe was
nailed to the wall.
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, I am told that a horseshoe will bring
you good luck whether you believe in it or not!”