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I am embarrassed to admit I found Jack’s information about pendulums almost as revelatory as his information about Stonehenge. I knew that pendulums swung back link and forth link for a reason, but I was never clear on what it was. At any rate, no one, not even me, can be underwhelmed by the fact that a pendulum .994 meters long makes exactly one swing per second, and a pendulum twice that link long makes one swing every two seconds. That’s cool.