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Nature 424, 1002-1003 (28 August 2003) | doi:10.1038/4241002a

Turbulence: Suddenly it's chaos

George Pickett

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Injecting vortices into a rotating sample of superfluid helium-3 shows a sudden switch from smooth to chaotic behaviour, and throws light on turbulence — one of the last unsolved problems of classical physics.

Leonardo sketched it. Hydrodynamicists model it.