ELI5 Non-stick Pans - are they safe?

Why was there a sudden change in Teflon plans in 2015? Are newer versions of Teflon safe? What is the chemical used to make Teflon that is in the bloodstream of 99.7% of Americans?   ... We explain like i'm five!   Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: dj_orka99, thebiga1806, doctormodalus, chem_equals, cicya, twatical, d2nekon and tracygee To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]