This article in Scientific American was triggered by a debate in hearing before a US House of Representatives committee on the issue of whether mobile phones are safe.

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About ten years ago an aquaintance of ours in the UK had a mobile sound system powered by bicycle, which he used to take around the summer festival circuit. As long as someone in the tent pedalled the bike, you got music and lights. There was generally a line of pumped-up clubbers eager to jump on the bike.

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