Wife of Pi cartoon by The Argyle Sweater

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As many readers will know, the comic above refers to the Greek philosopher Zeno, from about 490 BCE. He is famous for his “argument against motion” paradox. To get to a place, said Zeno, we must first go half way there. Once there, we must go half the remaining distance, or one fourth. Then we must move half the remaining distance, or one eighth, etc. So, moving from one place to another requires an infinite number of motions, which is impossible.

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