What Causes Headaches?

Aren't you glad you can just take an aspirin instead of getting a hole drilled into your head? I feel for people who are not helped by that miracle drug. Even better, I realize that the older I get, the fewer headaches I have. It's not that I have less stress now, but I handle that stress better. Or maybe I'm just less sensitive to pain as I age. (via Geeks Are Sexy)