First Human X-ray 1896
To know something like the back of your hand is a timeless concept,
one taken yet further by Wilhelm Konrad Roentgen. While working on
a series of experiments with a Crookes tube, he noticed that a bit
of barium platinocyanide emitted a fluorescent glow. He then laid
a photographic plate behind his wife’s hand (note the wedding
rings), and made the first X-ray photo. Before that, physicians were
unable to look inside a person’s body without making an incision.
Roentgen was the recipient of the first Nobel Prize for Physics in
1901.