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| Turbulence: The fields of pressure, potential fluctuations and turbulent flux at the plasma edge in a simulated fusion experiment. The core is not simulated but replaced by a constant energy source. The movie shows a saturated state with bursts and sheared rotation. (Courtesy Peter Beyer, Université de Provence.) | Coherent structure: A large low-pressure system off Australia’s southern coast on 20 February 2002. |