I've had little Spin Art machines in a cupboard for 10 years, and when I finally got them out to use, I realized that batteries were required. Why bother getting batteries, when I have a quality potter's wheel that can do the same thing? Today my students taped paper to the center of the wheel, put the pedal to the metal, and started squirting gel paints to the paper. It only takes a couple seconds to make the images, but being able to create a science lesson on centripetal force that includes a fun painting experience is totally worth the tiny bit of effort.
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