Word: lightstruck
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Mass & Energy. In 1896 Henri Becquerel discovered radioactivity, which is the spontaneous release of atomic energy by certain heavy metals. Becquerel had some photographic plates lying in a dark drawer near a bit of uranium; he found the plates lightstruck. His researches led to the discovery of radium by Pierre and Marie Curie, and it was by using radium for cancer therapy that man first harnessed atomic energy to his own ends...
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