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Topological Tuesday. Can you tie a not in a closed loop? Yes. (Hint: theoretical knots and knots in the real world differ in a significant way.) And knotted vortices. simonsfoundation.org/2013/01/03/mathematical-impressions-knot-possible/#Permalink On twitter.com
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Grumble. Twitter lost the second link in that tweet: youtube.com/watch?v=Ja886GtHlcEOn twitter.com