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PFAS is going to be the asbestos of our generation, except it won't be so easy to get rid of this time around. It's more like the asbestos of every future generation until we find a way to reliably break it down.

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That or it will be a natural form of selection for old age, increasing human longevity at the expense of temporary population reduction. Let's hope artificial gene therapy is within our lifetimes or hope we drew the golden ticket.

If you have already had children and raised them to adulthood (Alzheimer’s first appears primarily in your mid 60s or later), what exactly is the selective pressure mechanism?

Genetic sequencing. We will eliminate the embryos we don't want.

>it will be a natural form of selection for old age, increasing human longevity

I don't think genetic sequencing falls into the category of "natural selection".

Ok people not wanting to have kids because of a family history of Parkinson's disease.

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