"Filamental Vortex Loops," such as those found in smoke rings and mushroom clouds, crop up in a number of applications in fluid dynamics. Earlier this year, scientists created a long-sought twist on this phenomenon: knotted vortex loops.
With the help of 3-D printer-created hydrofoils, lasers, and a high-speed camera, researchers from the University of Chicago collected the beautiful images in this video.
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