Three days after a catastrophic wall of water, mud and rock tore through Nepal's Himalayan valleys, the scale of the disaster is still coming into focus. At least 579 people are now confirmed dead, nearly 2,000 remain missing, and the danger is not over. Authorities are closely watching lakes formed in the wake of the glacier collapse, amid fears of further flooding. Stephanie Sy reports.

Just over three years ago, the deadliest U.S. wildfire in more than a century devastated the Hawaiian island of Maui. New research suggests the toll of the disaster may be far greater than the lives lost and property burned. Stephanie Sy reports on a landmark study aiming to track how wildfires continue to affect survivors' health long after the flames are gone.