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Lightning is fascinating. Lightning is a bright flash of electricity produced by a thunderstorm. If you hear the sound of thunder you are in danger from lightning. Lightning kills and injures more people every year than hurricanes or tornadoes. Lightning is an electric current inside of a thundercloud up in the sky where tiny bits of frozen raindrops bump into each other as they move around in the air. All of those collisions create an electric charge. When the cloud fills with electrical charges lightning strikes.