In the aftermath of a devastating earthquake, even as lives are saved and homes begin to rise again, hidden wounds linger for many survivors long after the ground stops shaking. In Dingri County, Xigaze, in southwest China's Xizang Autonomous Region, a group of psychological aid workers is helping people mend hearts marked by loss and fear. Through biting cold and thin air, across language barriers, and within Tibetan culture and faith, a quiet healing is underway here on the roof of the world.