Word: selenium
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Dates: during 1948-1948
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...stumbled on the cause: a shaft of sunlight, streaming through the window, fell on an electrical resister and jammed his code receiver. When May passed his hand between the light and the resister, the hum stopped. But why? May decided, rightly and brightly, that the resister (or the selenium that coated it) must have what are now called photoelectric properties; i.e., that it could convert light values into electric values...