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Magic in a Minute by Mac and Bill King for November 10, 2019

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  1. Coexist
    Bookworm  3 months ago

    This is (mathematically) a simple Mobius strip; it has (topologically) only one surface. You can prove this by making the loop as shown, and place a pen in the center between the two edges and pull the paper under the pen. Eventually, the line will meet itself.

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