Read the excerpt from “Raymond's Run.”There is no track meet that I don’t win the first-place medal. I use to win the twenty-yard dash when I was a little kid in kindergarten. Nowadays, it’s the fifty-yard dash. And tomorrow I’m subject to run the quarter-meter relay all by myself and come in first, second, and third. The big kids call me Mercury ‘cause I’m the swiftest thing in the neighborhood.