Nepal could experience substantial aftershocks for years

In the days since a magnitude 7.8 earthquake struck Nepal on Saturday and killed more than 4,300 people, dozens of aftershocks of 4.5 magnitude and greater have hit as well, and the U.S. Geological Survey warns that there is a better than 50-50 chance of another 6.0 quake or higher taking place in the next week and the next month. The USGS forecast is based on where the earthquake took place -- in this case, a deep boundary between colliding continental plates, NPR reports. It released stress th...