Per- and polyfluorinated substances are in all kinds of products from waterproof makeup to fire retardants. Dr. Ned Calonge, co-author of a new report from the National Academies of Sciences, Engineering and Medicine, talks with Stephanie Desmon about these "forever chemicals" and what is known about their impact on health, who is most at risk, and what people should do if they have high levels of exposure. Read the report here: https://nap.nationalacademies.org/catalog/26156/guidance-on-pfas-exposure-testing-and-clinical-follow-up
