When she was 16, Rana Abdelhamid was accosted on the streets of New York by a man who tried to pull off the head scarf she wears as a symbol of her commitment to her Muslim faith. Rather than withdraw, as she'd seen other Muslim women do, she turned her anger into a program that is now working with young Muslim women to teach them self-defense while encouraging them to become leaders and role models for others in their communities. Abdelhamid, a graduate of Vermont's Middlebury College who is now a student at the Harvard Kennedy School of Government, says...