In my Nature article Physicists twist water into knots, Dustin Kleckner and William Irvine, physicists at University of Chicago, Illinois, break new ground by capturing the twisting and knotting of a vortex in water. They do so, in part, through the use of a three-dimensional printer and laser-scanned air bubbles injected into the fluid. Better understanding these complex vortices is important to elementary particle physics and understanding why the Sun’s outer atmosphere is hotter than its surface.

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