Ayesha Afghan, 16, writes that President Trump’s executive order ending birthright citizenship is “a direct threat to the lives of children.” By The Learning Network To participate, submit ...

Chlorinated polyfluorinated ether sulfonates (Cl-PFESAs) are one kind of replacement chemistry for perfluorooctanesulfonate (PFOS). Recent studies have shown that Cl-PFESAs could interfere with ...