Demonstrators gather at a rally to protest against a national and international use of Per- and polyfluoroalkyl substances (PFAS), as a precautionary principle, in Oullins on May 26, 2024. PFAS, Per- and polyfluoroalkyl substances), are a family of around 4,000 chemical compounds often referred to as "forever chemicals" because of their long lifespans in bodies and the environment. They resist grease, oil, water and heat. (Photo by JEAN-PHILIPPE KSIAZEK / AFP)