Fun Science Idea

Rolling Coin in Balloon

Put a coin in a large balloon, and then inflate it fully. Tie the balloon or hold its end closed. Swirl the balloon until the coin rolls on its edge inside the balloon. Once the coin is rolling smoothly, it is amazingly stable. You can keep it going for a long time by moving the balloon back and forth rapidly.  Using a coin with a rough edge, such as a dime may make an interesting sound.

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