3M apparently knew about PFOA/PFOS dangers since 1970s

Apparently 3M, which many people think of as a nice company, has known about the dangers of PFOA and PFOS — which is used to make Teflon and other products — for a long time. Per this story, “Internal studies and other documents show that 3M knew by the 1970s that PFOA and PFOS were toxic and accumulating in people's blood.”