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My conjecture about heating of the air being the cause of whirligig
motion is simply based on the seeming independence of the effect on
polarity. The light mill is well understood (I even understand it)
and the "conventional" explanation is very wrong, but it is
irrelevant to the whirligig.
Why does heated air push on a pointed wire? Well, if that's where
the air is preferentially heated, where else would one expect it to
push?