(New York Times) – Reza Mohammadi lost his parents in a forest in Macedonia. Or Serbia. He does not remember. What he does remember is that it was raining: Thick mud clung to his shoes and weighed down his 7-year-old legs. His family had fled from Afghanistan to Iran, then to Turkey. They had boarded a rubber boat to Greece and were rescued by the coast guard before moving on, mostly by foot, toward Germany.