How much do a few hertz hurt? (electromagnetic radiation may cause cancer; includes related article on Heinrich Hertz and James Clerk Maxwell)

The Economist (US) | April 16, 1988 | Copyright

ELECTROMAGNETIC radiation is here, there and everywhere. As well as x-rays and gamma rays and visible light, there are also electromagnetic waves given off by electrical apparatus of all sorts, from razors to washing machines; in the rich countries everyone is continuously bathed in them. Until recently, waves from such sources were considered harmless.

The frequencies of waves are measured in hertz (Hz), for reasons explained in the box on the next page. One hertz means one wave each second. The waves come off normal domestic appliances at frequencies of 6OHz, if ...

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