> ## Content Index
> Fetch the complete content index at: https://www.cascadepbs.org/llms.txt
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# Toxic “Forever Chemicals” Found in Americans' Blood
- URL: https://www.cascadepbs.org/show/nova/extras/toxic-forever-chemicals-are-found-in-the-blood-of-most-kthgc/
- Published: 2024-04-02T23:11:03.000Z
- Updated: 2025-05-21T13:45:31.000Z
- Author: Cascade PBS Staff
- Tags: NOVA, #ZZZ_Show_8f1ff589-6222-4260-acbf-0523a6424abf, #v1.3, #ZZZ_Extra_7075b7cf-356e-4662-b7c7-c0a2470f86ef, #extra

What makes PFAS chemicals extremely useful — and extremely hard to get rid of — are bonds between carbon and fluorine atoms that are almost impossible to break.