"Corpse medicine was a form of medicinal practice that took place in the 16th and 17th centuries. It was widely believed that the human body contained everything needed to cure people.
For example, bandages soaked in human fat would be used to ‘cure’ wounds. This died out by the 18th century, thankfully!"
And one of them is under Yellowstone National Park, enjoy your vacation...
Yellowstone has gotten more active as well
and that's not even a big one