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All you need is a pool, a plate, and some food color.  Physics girl does an
experiment that cause weird black circles to form just be dragging a plate
through a pool.  On a nice clear sunny day you can see the black circle
vortex travel through the whole pool.  How does this happen?  Watch and
learn.
​>>​


http://www.sun-gazing.com/physics-girl-unique-crazy-pool-vortex/

​Harry​

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