Behold: The world's largest Tesla coil

Electrical engineer Greg Leyh built the giant Tesla coil in this video, and wants to construct an even larger version: Two 10-story-high towers that would send lightning zinging across an area the length of a football field. New Scientist interviewed Leyh, to find out what the point of this is (besides the obvious inherent awesomeness):

Lightning can break down air up to five times more easily than normal electric arcs [between two oppositely charged rods in the lab], using tricks we don't yet understand. However, recent theories and a few tantalising experimental results suggest that normal arcs start to gain lightning-like abilities once they grow past about 60 metres in length. If we can build a machine this large, we'll very quickly arrive at a better understanding of what's going on.

A couple of weeks ago, Pesco pointed out that you can actually donate money towards making this project happen. Double awesome!

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