If you are an adult living in the United States, you have probably heard something about per- and polyfluoroalkyl substances, better known as PFAS. What I think many people still do not appreciate is just how widespread these chemicals have become, likewise how difficult some of them are for both the environment and our bodies to get rid of. PFAS are not one chemical. They are an enormous family of synthetic fluorinated compounds that have been used because they can confer so