This might be one of the most famous images in photographic history.
The first ever X-ray image was taken in 1895 by Wilhelm Röntgen, who was awarded the first Nobel Prize in Physics in 1901.
The image of his wife Bertha's hand (wedding ring clearly visible) propelled Röntgen into an international celebrity. The medical implications were immediately realised. Röntgen named the discovery X-radiation, or X-rays, after the mathematical term 'X', which denotes something unknown.