A few years ago, I wandered into a sports arena in Virginia’s D.C. suburbs and discovered roller derby. The Cherry Blossom Bombshells and Scare Force One – the top two teams in the DC Rollergirls league – were cruising around an indoor skating track, elbowing one another, dodging body checks, wiping out, and getting right back up again. It was a kick-ass dance on wheels. The skaters wore short skirts, heavy makeup, and fishnets. There were lots of tattoos, blue and pink hairdos, and bruises.