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 ...

Lightning is a force of nature. Traveling at a speed of 100,000 km/h, with a temperature five times that of the Sun's surface, it strikes the Earth millions of times a day. But what makes lightning?

Lightning has captured people's fascination for millennia. It's embedded in mythology, religion and popular culture. Think of Thor in Norse mythology or Indra in Hinduism. In Australia, lightning is ...

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 ...