Story by Catherine E. Shoichet, CNN
Video by Claudia Morales, CNN
Photographs by Melissa Golden and Nichole Sobecki
Updated 2148 GMT (0548 HKT) February 21, 2017
(CNN)Abdalla hears his English teacher's voice beaming across the room like a ray of sunshine.
Briana Duggan and Nick Migwi contributed reporting and video from Kakuma refugee camp in Kenya. Greg Kilday and Jordan Mendys contributed video from Atlanta.