The Carter Center has the only existing international taskforce on disease eradication. Which means a total elimination of a disease on the face of the Earth. In the history of the world there's only been one disease eradicated: smallpox. The second disease I think is gonna be guinea worm.
Jewelry and pins have been worn throughout history as symbols of power sending messages. Interestingly enough it was mostly men who wore the jewelry in various times and obviously crowns were part of signals that were being sent throughout history by people of rank.
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You look at the greatest villains in human history the fascists the autocrats they all wanted people to kneel before them because they don't love themselves enough.