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August 16, 2016 05:30 am PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/ag2VQuwa4u8/why-swirling-spheres-shift-rot.html
Why swirling spheres shift rotation at a certain number
Swirling a ball in a cup gets it spinning in the direction of the swirl, but adding six more starts them swirling in the opposite direction.
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/ag2VQuwa4u8/why-swirling-spheres-shift-rot.html
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