Linking two smoke rings or tying a single ring into a knot is no easy feat. Such topological vortices are now created in water with the aid of specially printed hydrofoils.
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Lathrop, D., Brawn-Cinani, B. Lord Kelvin's vortex rings. Nature Phys 9, 207–208 (2013). https://doi.org/10.1038/nphys2577
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DOI: https://doi.org/10.1038/nphys2577