[youtube]http://www.youtube.com/watch?v=-bvmEYxEYiA&feature=player_embedded[/youtube]

YouTube Link

This is an amazing video of the formation of a lightning bolt slowed down 300x.  The branching and patterning is absolutely amazing.

 

The multiple tower upward lightning flash was captured in Rapid City, SD on 6/16/10. A preceding downward positive ground flash triggers upward leaders from seven towers, three of which are visible in the video.

Via science blogs

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