We still don't know exactly how many Iraqis have fled their homes, where they've all gone, or how they're managing to survive. Here is what we do know: More than 2 million people are refugees inside their own country -- without homes, jobs and, to a terrible degree, without medicine, food or clean water. Ethnic cleansing and other acts of unspeakable violence have driven them into a vast and very dangerous no-man's land. Many of the survivors huddle in mosques, in abandoned buildings with no electricity, in tents or in one-room huts made of straw and mud. Fifty-eight percent of these internally displaced people are younger than 12 years old.