This flip is obviously not impossible, because world class Australian skater Jackson Pilz did it before your very eyes, but it is a trick that skaters call "the Impossible." Physics Girl collaborated with Rodney Mullen, who is credited with creating the Impossible, to explain the physics of the trick. The Impossible flip is shown at five minutes in, but the background leading up to it is interesting, too.
-via Boing Boing
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