Scientists and government authorities were working on an early warning system for glacial floods at a Himalayan lake in northeast India when it broke its banks this week with deadly consequences. Mountainous Sikkim state plunged into chaos on Wednesday as floods spurred by heavy rain and an avalanche killed at least 18 people. It was one of the worst disasters in the region in 50 years, and more than 100 people remained missing on Thursday. The first part of the system, a camera to monitor Lhonak Lake's level and weather instruments, were installed last month, officials involved in the project...