Gyration…
Extract from Wednesday’s General Relativity class:
Me, at the board writing equations: “…and so the ratio of the earth’s radius to its radius of gyration is about 0.577…”
Student raises hand and asks: “What’s radius of gyration?”
Me: “Er… It’s the average spacing everyone has to give you at the night club when you go Ker-ray-zay on the dance floor.”
As luck would have it, everyone laughed. That would have been a terrible time to have an awkward silence.
