Filming the Vortex Vision!
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Did you know that small vortices like what you see in your sink, bathtub, and toilet can actually flow either direction? Many people think that the Coriolis Effect of the Earth (basically, the idea that air and water veer to the right in the northern hemisphere and to the left in the southern hemisphere) causes them to flow in only one direction. In fact, you can force the water to spin the other direction by stirring it!