When a torrent of water, rock and mud tore through Nepal’s Himalayan mountain valleys on Aug. 26, following the collapse of a glacier and the mountainside beneath it, more than 1,300 people were killed and nearly 5,000 are still missing. Tens of thousands of other lives have been severely disrupted: Nepal’s economy has ground to a halt and many schools were destroyed. The disaster began when a huge section of glacier and rock fell more than 1,200 meters into the valley below, causing water leve
