Whenever I see a slow-motion video of lightning, I see that there are some sort of balls going around before the real discharge.

My question is.. what are those? (Video for reference: https://vimeo.com/133398724)

Also, it seems like if those balls were doing a graph-like search, and when one ball reaches "ground", then it discharges all the energy, I wish to read and understand about that, but I just don't know the term of it so that I can go search.



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