Evidence my 14yr old daughter is geek-literate: In lieu of OK, one might type K while texting. She instead typed "Potassium".
A comprehensive education is a well-stocked pharmacy: but we have no assurance that potassium cyanide will not be administered fora head cold.
Connection between life and radioactive nuclei is straightforward. No life without tectonic activity, without volcanic activity. And we know very well that geothermal energy is mostly produced by decay of uranium, thorium, and potassium.
You can't ask your pharmacist to stock larger quantities of potassium nitrate because you want to make a bigger rocket.