Facts of the matter
May 13, 2022
3 minutes
By PD Smith
n 1895, the German physicist Wilhelm Röntgen noticed that a phosphor-coated screen gave off a green light when exposed to a cathode ray tube. He spent seven weeks investigating, locked away in his laboratory and only coming out when his wife, Anna, insisted he eat something. He rewarded her concern for his wellbeing by using the unknown rays to make an image of her hand on a photographic plate. It proved that
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