Masuma Ahuja, author of Girlhood: Teenagers Around The World In Their Own Voices, set out to document girls' ordinary lives. Kassy Cho hide caption
#15Girls
Fatmeh, a Syrian refugee, lives in a makeshift shelter in Lebanon. She who works in the fields up to 14 hours a day — and wishes she could be back in school. Dalia Khamissy for NPR hide caption
Girl Up activists pose during their leadership summit in Washington, D.C. Top row, left to right: Keza Latifah Mashenge, Fiona Adams, Nehal Jain, Sarah Gulley. Second row: Kyung Mi Lee, Sarah Hesterman, Janice Catherine Yang. Kristin Adair/NPR hide caption
Woinshet Zebene Negash stands with actress Maria Bello at Half the Sky Live, an International Women's Day Event in 2010. Martin Roe/via Getty Images hide caption
Kamala in front of the hut where she sleeps when she has her period. Kamala told us, "I'm afraid of snakes and men." Jane Greenhalgh/NPR hide caption
Lala (center) and Milena (left) would like to see more incentives for young girls to take up soccer. Lianne Milton for NPR hide caption
Prakriti Kandel wants to put a halt to menstrual taboos in Nepal â and the discrimination that goes with them. Poulomi Basu/VII Mentor for NPR hide caption
Leslie Morales (from left), Soraya Mohamud and Tanjum Choudhury discuss what it's like to be 15. All three are sophomores at Montgomery Blair High School in Silver Spring, Md. Akash Ghai/NPR hide caption
Who's ahead in the baby tally these days — boys or girls? Newborns are ready to be counted in a Florida hospital. JOHN STANMEYER/National Geographic hide caption