A xenon flash consists of a small glass tube filled with xenon gas. When a very high voltage current of electricity is applied, the tube emits a very bright - but very brief - flash of white light.

Mountaineers summit the world's highest mountains through the process of slowly acclimating to thin air - now technology intervenes.

Scientists use devices known as frequency comb lasers to search for methane in the air above oil and gas operations and to screen for signs of infection in human breath. A new study could help make ...