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Disproving perpetual motion machines like this can have its rewards. In 1900-1905 Albert Einstein worked for the Swiss patent office while studying for his Ph.D. at the University of Zurich. One of his tasks was to determine if the devices being submitted for patent involved perpetual motion...

This reminds me of the occasional April issues of various science and electronics magazines. They will include an apparently real article that is finally revealed to be an April Fools joke. Examples of articles: A new 1-bit microprocessor that takes RISC chips to a new level. In the text it...