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The violent churning of river water as currents of different speeds collide over rapids.The dull thrum of air buffeting the window of a moving car. The sudden change in color when cream is stirred into coffee. The energy of these events results from the interplay of fluids with an object on the move. At the heart of each is a process called turbulence that has held the attention of Professor Bob Moser for some 30-plus years, with no java jolt required to boost his enthusiasm.