Lightning is a huge spark of electricity. It strikes when an electric current is able to travel through what would normally be an insulating material, in this case the air.
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Videographic locating the site of a fatal train crash near Turin in northern Italy.
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Videographic illustrating the route of the daunting Route du Rhum yacht race. The skippers set off on Sunday.
China’s President Xi Jinping officially opened the world’s longest sea bridge connecting Hong Kong, Macau and mainland China Tuesday. Location in videographic.