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Wilhelm Röntgen discovered X-rays #OTD in 1895 when he noticed that emanations from a Crookes tube caused a platino-barium screen to fluoresce. The rays exposed photographic plates but were blocked by bone and metal.

This early plate shows his wife's hand.

Image: Wellcome Trust

One of the first X-ray photographs, an exposure of the left hand of Rontgen's wife. You can see her four finger, the dark mass of a ring on her ring finger, and the faint shadow of the soft tissue.
#otd
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