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The stuff we humans can do ! I wish my hands were painted like that, except, well, then I wouldn't be able to use them for anything else. Like, I wouldn't be able to conquer evil doers or save the world or crack super secret spy codes or bake pink chiffon cakes or do ballet or macrame or anything! It would be awful! But, you have to admit, they are pretty cool.
Röntgen discovered [the] medical use [of x-rays] when he made a picture of his wife's hand on a photographic plate formed due to X-rays. The photograph of his wife's hand was the first ever photograph of a human body part using X-rays. When she saw the picture, she said "I have seen my death."