Per-/poly-fluroalkyl substances, or PFAS, are everywhere. They are used in firefighting foam, car wax, and even fast-food wrappers. They're one of the most toxic substances ever identified -- harmful at concentrations in the parts per trillion -- yet very little is known about them.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/10/201029122943.htm
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