It’s been two years since the world was shaken by the mass-kidnapping of nearly 300 Nigerian schoolgirls by the terror group Boko Haram, taking them in as prisoners, sex slaves, and child soldiers and spawning the hashtag #BringBackOurGirls. But intervention from US drones and assistance from neighboring countries in support of the Nigerian military says that only 57 have been saved. Learn more on this story below.