In the middle of the desert in Kenya, there's a place with a population the size of Minneapolis, called Dadaab.
It's no ordinary city. This is the largest refugee camp in the world, home to nearly half a million people. Most came from Somalia, escaping the civil war that began in the early 1990s.
Ben Rawlence spent years working in the camp — first with Human Rights Watch, then as a journalist. He just published a book called City of Thorns: Nine Lives in the World's Largest Refugee Camp.