Half the children of the world -- the girls -- are treated unfairly because of their gender. But girls around the world are taking action. The International Day of the Girl features nine inspiring stories based on real girls' experiences with gender inequality. From Brazil to Afghanistan to Canada, each story highlights issues faced by girls -- including gender-based violence, illiteracy, sanitation and child marriage -- and how they've overcome their adversities using intelligence, creativity, bravery and kindness.