When Hurricane Katrina struck, many displaced families were left wondering how to explain the changes to their children with autism, said Lynda Geller, a professor of child and adolescent psychiatry at the New York University's School of Medicine.

CNN: Looking for hope in the ashes

The conflict, which left more than two million people dead and hundreds of thousands displaced, forced Ajak to flee his country when he was just five years old.

CNN: Wrestlers fight to unite world's newest nation