From the FCS Book of Little-Known Facts (x-ray)

First medical X-ray by Wilhelm Röntgen of his wife’s hand.

Wilhelm Conrad Röntgen discovered the scientific mechanisms behind what would eventually become the X-ray back in 1895, successfully imaging the bones of his wife’s hand, but it wasn’t until Thomas Edison and Clarence Dally began tinkering that a reliable X-ray machine was first built. They’d meant to show it in 1901, but the shooting of President William McKinley in town during the fair put a damper on things. Funnily enough, had his doctors had access to the X-ray machine, they might have found the hidden bullet lodged in his abdomen. Instead, it was shown in 1904 and changed the field of medicine forever.

There is never a time
to stop learning new things