Today I'm thankful for appropriate immune systems. While our family fights its share of germs, our immune systems are doing the right thing.
Two things make me particularly grateful for well behaved immune systems today. One of my student's sisters have a disorder that prevents their bodies from "doing the right thing" when they encounter germs, so they suffer from massive infections. On the other extreme, I used to suffer from ulcerative colitis--basically, my immune system was inappropriately attacking me. I am extremely thankful thatI was healed of this, and haven't had an attack since 2006.