Turtles All The Way Down

There is an old anecdote of a respected philosopher giving a public lecture on astronomy, in which he explains the data showing that the Earth orbits the Sun, and the Sun in turn, revolves around the center of the Milky Way galaxy. After the lecture, the lore goes, an old lady tells the philosopher that his ideas are nonsense. “The world stands on the back of a giant turtle,” she says. 

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