Scientists have identified the 19th form of water ice. The exotic, four-sided crystals of this rare ice variety, now dubbed ice XIX, form at ultra-low temperatures and ultra-high pressures. It only ...

At the heart of clouds are ice crystals. And at the heart of ice crystals, often, are aerosol particles - dust in the atmosphere onto which ice can form more easily than in the open air. It's a bit ...

At the heart of ice crystals, often, are aerosol particles onto which ice can form more easily than in the open air. It's a bit mysterious how this happens, though. New research shows how crystals of ...