I've read more than a handful of articles on PFAS, but this one really underscored just how prevalent they are- concentrated in fish, dental floss, blood donations, shoes, food packaging, explosives, food, water, the air, etc. Not only does the sheer number of them concern me, but the fact that they will be difficult to replace in anything that needs to be waterproof, high temperature resistant, or perhaps airtight is concerning.