In my last column, I mentioned how I never get sick. Typing those words made me uncomfortable — like I was tempting fate. It’s like washing your car in the beautiful Colorado sunshine. You just know it’s going to rain the next day. That’s how I felt, and it nagged at me. Was I really as healthy as I thought? I turned in my column, but I couldn’t stop thinking about it. I didn’t feel sick, but surely, at my age, there must be something wrong with me. Was there something I had overlooked? That’s when I remembered that thing on my back.