 All right, now, it's National Multiple Sclerosis Week. This is a common immune system disorder. How does it happen? I have a friend who's a farmer who's had it most of his life. He takes drugs for it. Some days he's good, other days he's not. There are a couple of million people that apparently have it. And many times people don't even know they have it. I guess you can find it in a blood test, right, if you don't have the obvious symptoms. But sometimes the symptoms get worse.