A visitor to Niels Bohr's country cottage asked him about a horseshoe nailed
above the front door. "Surely Professor Bohr", the guest asserted, "You do not really believe
that a horseshoe above the entrance to a home brings good luck?" "No," answered Bohr, "I certainly
do not believe in this superstition. But you know," he added, "they say it brings good luck even
if you don't believe in it."
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