We learned that many things spin. Some need force like tops and zoomers. But some of them spin by themselves. We got this piece of paper, and then we folded it on the dotted lines. And then we put the paper clip at the bottom. Then you go on a chair and you let go of the twirler and see if it spins or not. It spins when the air is pushing the wings. It spins when the gravity is pulling it down and the air is pushing it up.
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