In seventh grade, I broke my finger pretending to be a Harlem Globetrotter with the neighborhood boys. Until then, I'd been their equal in sports, but suddenly their shoulders were battering rams, and I was the house of straw from the Three Little Pigs. I hated being a puny, weak-armed girl. But then I saw Sigourney Weaver and Linda Hamilton going mano a mano with aliens and cyborgs, and I realized that I didn't have to be a damsel in distress. Those ladies can pummel any guy on the planet — or in outer space. Here are three books with girls who know how to fight.