(CNN) – On a concrete pad in the middle of a dusty village in northern Iraq, children sit attentively as an animated pair of teachers delivers the lesson. Keeping the attention of these youngsters could mean the difference between them living or dying. “Is this something you can touch in the street?” one teacher asks the children, pointing at poster of photographs, including toys. “No!” comes the answer, loudly and in unison. The lesson has been learned: an enemy without a conscience will — and has — booby-trapped toys.