It's not known but among other things there is some evidence that it comes from a viral infection earlier in life. Multiple sclerosis is another thing like that.
> Be kind. Don't be snarky. Converse curiously; don't cross-examine. Edit out swipes.
> When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3."
Your comments in this thread would be more constructive without the swipes.
It's all well and good for you to discipline me, and I will be happy to edit and abide, but what's not good is you letting others unfairly chew me alive. It's just wrong.
Yes, you're right. Multiple people in the thread needed to be reminded of this.
I wrote my comment in reply to you since you seemed to be the most active, and several of your replies were the most recent at the time I was responding.
https://www.science.org/content/article/study-links-viral-in...