In the 20th century, scientists developed a group of complex, manmade chemicals called per- and polyfluoroalkyl substances (PFAS). In the past decade, researchers have found these chemicals contaminating drinking water and the environment. Current research measures them at alarming rates in breast milk. The properties of these substances include oil and water repellency, temperature resistance, and friction reduction. Experts estimate there may be up to 10,000 of these forever chemicals, the full effects of which aren’t yet known. The most widely recognized PFAS are perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), both associated with kidney and testicular cancers. This family of chemicals is also linked to endocrine disruption and a host of other problems in people who live in communities that have heavily contaminated drinking water. Out of the 10,000 forever chemicals, 3M agreed to stop making PFOS in 2002 and DuPont began phasing out PFOA in 2005. Yet, with …