They don’t know. It’s found in sperm and embryos too.

My guess: it’s the cause of low sperm count

So thats why everyone is so fat

I like to think your body just uses it to replace some other organic materials. So effectively we’re now beings who are like 0.5% made of plastic.

Mostly down the toilet.

Everywhere. They are very, very small. Small enough to cross the blood-brain barrier.