Once upon a time, women and girls were told they couldn't run marathons, become doctors, or become fighter pilots because they weren't smart enough or strong enough or they couldn't be mothers and have jobs at the same time. It took many women working together to change these ideas, change the rules, and show the world what girls and women can accomplish. In What Girls are Made Of, authors Lucia Marquez and Dalila Marquez offer a look at the accomplishments of three women: Roberta Gibb, who was the first woman to run the Boston Marathon; Patsy Mink, the first minority woman to be elected to Congress who worked toward women's rights in academics; and Tammie Shults, among the first women fighter pilots. This book for young readers shares the accomplishments of three women who didn't listen when others said, "Girls can't do that".