I think the molecular structure is very similar to a necessary molecule (fat or sth.?). So the PFAS get in the place a normal molecule should be but they do the job not as good. Something like that. Great MinuteEarth Video about PFAS (4’) https://www.youtube.com/watch?v=H3aFzQdWQTg
People who are using their cellphone/mobile as a telefon (calling someone) but not holding it as a telephone but as a slab in front of their face. And ofc with the speaker on.
Slightly better but still stupid: Videocalling (or Facetiming) with the phone right in front of their nose.
I mean, just hold the phone so that the speaker is at your ear and the mic is right by your mouth…