Pakistani teen and education activist Malala Yousafzai marked her 18th birthday on Sunday by opening a school for Syrian refugee girls in Lebanon. The youngest winner of the Nobel Peace Prize urged world leaders to invest in "books instead of bullets." Funded by non-profit Malala Fund, the school in Bekaa Valley can hold up to 200 girls aged 14 to 18. Malala rose to international fame after she was shot in the head by the Taliban in 2012 for advocating for girls' rights to education. "I decided to be in Lebanon because I believe that the voices of the Syrian refugees need to be heard and they have been ignored for so long," she said.