On cold, sunny days, tiny ice crystals in the atmosphere can create breathtaking displays like halos, sundogs, and light pillars.

Researchers created ice crystals with a near-perfect cubic arrangement of water molecules, in order to better understand how high-altitude ice clouds interact with sunlight and the atmosphere. In this ...

For scientists and engineers, the best way to understand a new or unknown material--whether it's an alloy, a pharmaceutical or a meteorite--is to delve into its atoms. Techniques such as X-ray ...