Physicists Create A Water Vortex That Ties Itself In Knots [video](popsci.com)
popsci.com
Physicists Create A Water Vortex That Ties Itself In Knots [video]
http://www.popsci.com/science/article/2013-03/physicists-create-water-vortex-ties-itself-knots-water-video
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