From Wikipedia,Hand mit Ringen (Hand with Ring): print of Wilhelm Röntgen's first "medical" X-ray, of his wife's hand, taken on 22 December 1895 and presented to Professor Ludwig Zehnder of the Physik Institut, University of Freiburg, on 1 January 1896. The dark oval on the third finger is a shadow produced by her ring.
DD10 and I were fascinated by a study earlier this year of how Mr. Roentgen's experiments lead to the discovery of X-ray and its usefulness. This was our favorite picture.
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