It's neat that so many life-saving compounds can be found in dirt. Another one is rapamycin, found in the soil of Easter island:

> Georges Nógrády wasn’t looking for cures when he divided Easter Island into 67 parcels and took a soil sample from each. The University of Montreal microbiologist was trying to understand why the islanders weren’t afflicted with tetanus, a bacterial infection often found in places with horses. Not only did horses outnumber the island’s inhabitants, but its people walked around barefoot—a notoriously easy way to pick up tetanus spores.

https://cen.acs.org/articles/94/i29/Rapamycins-Secrets-Unear...