In this June 1, 2016 photo, Maria Arias, center, works with classmates during a math class at her public high school in Caracas, Venezuela. Arias has been held at gunpoint once in school, by a boy so baby-faced she assumed he was a classmate of her 15-year-old sister. Instead, he leveled a gun at her sister's ribs and demanded the girls' flip phones. (Photo by Ariana Cubillos/AP Photo)
