This is a totally cool example of how science and nature go hand in hand. All this demonstration takes is a pool and a plate, and you'll have something amazing. This would also be a great lesson to teach your kids about science.

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When she drags the plate, you can see what happens at the bottom of the pool. When you look at it, it's hard to tell what's actually going on, but they are actually two small vortexes that are traveling next to each other. Watch the video to find out exactly why.