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Frictionless machine in a vacuum

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sinbecks2 | 23:39 Thu 14th Apr 2005 | Science
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I remember years ago seeing a device that looked like a large light bulb but contained a small windmill device inside. The windmill gently turned inside the vacuum in the bulb and looked like a frictionless machine with no obvious power source. Any idea what this device was called and how it works???

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