Later that afternoon we visited the Panthéon nearby. We saw Foucault’s pendulum and had an interesting discussion about why the plane of its swing rotates (and why it does not rotate 360° in a day, which at first surprised me). Saw the tombs of famous people below, where I learned that “live free or die” was coined by Diderot, and Nell remarked on a moving quotation from ?, one of the authors of the UN declaration on human rights, to the effect that nobody was free while there was one person not free in the world.

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