Very cool very
high speed video showing a lightning strike forming with a great description from
APOD. It did not unfold as I expected. Numerous "leaders" of electrons or negative ions shoot out from a cloud, branching like a tree in a manner that looks (and my guess is) fractal. One leader makes it to or almost to the ground where it connects with a positive charge and then this leader becomes the strike flowing with electrons/ions. It's really incredible when seen this slow. The video is from
Tom Warner.
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