As I learned to write my letters, my first-grade teacher insisted that I hold my pencil in a specific way. As she watched me, I held it the way she wanted me to. But when she turned away, I obstinately reverted the pencil to the way I found more comfortable.

I thought I was the secret winner in that battle of the wills, and I still hold my pencil in my own peculiar way. Decades later, however, I realize that my wise teacher knew that my stubborn habit would grow into a bad writing practice that would result in my hand…