Today’s Exercise Triptych

Nils Bohr, the founder of Quantum Physics, had a friend to dinner. As the friend left, he saw a horseshoe nailed above Bohr’s front door. He said to Bohr, accusingly “Nils, you’re a great scientist. You can’t believe in superstitions.” Bohr answered “I don’t, but apparently it works anyway.” Anyone know any good Physics Jokes?…