Quite scary since we don't know what causes it. I know there are some intelligent guesses, but my understanding is that we don't have any hard proof.
Yep, there is something going on here (some environment toxin that most/all of us are exposed to), but we don't know what it is
Hah, I've counted 10+ different intelligent(?) guesses in the replies.
Yep, there is something going on here (some environment toxin that most/all of us are exposed to), but we don't know what it is