It started with a quiver in my voice, a shaky hand, and a worried heart. I first noticed it in 2003, when I was fifty-seven. That quiver in my voice and my shaky hand didn’t fit well with my image as a self-confident, competent, take-charge professional. It also scared me. I began to imagine that it was due to some kind of horrible condition, from a brain tumor to Parkinson’s disease. The more I worried, the worse it got.