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The Mathematics of Knots (And Why You Can’t Untangle Some Loops No Matter How Hard You Try)
Take a shoelace, tie an overhand knot in it, and then glue the two ends together into a loop. You now have an object that mathematicians call a knot — and no matter how you twist, stretch, or fold that loop without cutting it, you can never make it back into a plain circle. This…
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