Per- and polyfluoroalkyl substances (PFAS) are persistent, they’re everywhere, and they're probably bad for you. PFAS are probably bad for you. Some of the detrimental health effects associated with the chemical compounds include liver disease, decreased fertility and hypertension in pregnant women, immune and developmental effects in children including decreased antibody response to vaccines, and certain organ cancers. In this talk, delivered in April 2024 at the annual Harvard Horizons Symposium, scientist Heidi Pickard, PhD '24, uncovers the prevalence of PFAS, as well as their impact on the environment and health.