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Smaller prizes in the range of $5 to 50 thousand administered through Innocentive have also been successful. The Rockefeller Foundation and others have sponsored contests for a solar-powered mosquito repellent device ( ) as well as Small-scale River Turbines for the Peruvian Jungle ( ). These smaller prizes generally engage a large community of solvers because they have low barriers to entry and the prize money fully covers R&D expenses.