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
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(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.