Something terrible happened on my street when I was kid, something that I had screened from my consciousness for many years until last weekend. My neighbor Scott Holderman and I were futzing about near the side of his house, setting up one of those epic Star Wars tête-à-têtes or digging for earthworms or doing whatever children do on nice days in quiet neighborhoods, and then there came a horrible screeching, the braking of an automobile that could not stop in time. The car had crested the steep hill of our street and slammed into a child who wandered into it....