When the pilot gives the order to fasten seat belts during a flight, and the other passengers start to worry about spilling their coffee, physicists might console themselves by recalling that Richard Feynman once described turbulence as the last great unsolved problem of classical physics. Although a complete understanding of turbulence in ordinary classical fluids remains elusive, physicists are making real progress in a different direction-the study of turbulence in quantum fluids.
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