On Monday, a giant 7.8-magnitude earthquake and an aftershock almost as big shook the earth in southern Turkey. The quakes sent ripples through neighboring countries, but the area along the Syrian-Turkish border was hit particularly hard. Thousands of people have been killed, and dozens of cities have been gutted. We hear from witnesses on the ground about what happened when the devastating tremors hit. Guest: Ben Hubbard, the Istanbul bureau chief for The New York Times.