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Knotty Thrills

Three physicists untie a 150-year-old tangle of a puzzle.
Topic: Physics + MathPhysics & MathNova

The problem of how to tie a knot out of a fluid had eluded scientists for a century and a half. Then, using a 3D printer, bubble mist, and a scaled-down version of a laser light show, three physicists from the University of Chicago did it. And the results are mesmerizing.

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