The idiom "out of the blue," used to describe something unexpected, is derived from a potentially deadly weather phenomenon —a "bolt from the blue." According to the National Weather Service, a "bolt ...

Talk about a bolt from the blue. Scientists July 31 announced the discovery of the world's longest lightning flash ever detected – a whopping 515-mile-long bolt that blasted across central U.S. skies ...

Nothing more romantic than a discharge of energy that allows the atmosphere to restore electrostatic balance, lightning nonetheless thrills us, frightens us and holds us spellbound. As the National ...