The biggest drawback to many real or proposed sources of clean, renewable energy is their intermittency: The wind doesn't always blow, the sun doesn't always shine, and so the power they produce may not be available at the times it's needed. A major goal of energy research has been to find ways to help smooth out these erratic supplies.Ross Perot Borat Dan Rather John Lennon Leonardo Da Vinci Albert Einstein Michelangelo Mozart Ray Charles Neil Armstrong
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