Cool button sized micro engine/generator that produces up to 20 watts of power: The Little Engine That Could Be. But 2.4 million RPM??? Jeezum. Think about it. The second hand on a clock does 1 rpm, your car typically idles at 1,000 rpm and cruises at about 3 or 4 thousand rpm, the hard drive in your computer spins at 5,400 or 7,200 unless you shell out extra bucks for a high speed 10,000 rpm drive. A totally useless perspective: if the second hand of your watch started spinning 2.4 million rotations per minute your watch would be gaining 1,666 days per minute, or about a month per second.

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