Jane Arraf writes for NPR:
Mazen looks like he wants to disappear into his gray hoody as he sits in the corner of a tent in a camp for displaced Yazidis in Iraq. The 13-year-old boy's eyes are haunted and huge in a face still gaunt from not getting enough to eat.
After almost five years held captive by ISIS, Mazen says he wants to talk about what happened to him but he doesn't have the words.
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