Rattleback
Description
This Ancient Curiosity Spins One Way Easily, But Refuses To Spin The Other Way! Watch It Instead Rattle And Start To Spin Back The Other Way! (Before I Realized That The Key To Getting Jaysay'S Excellent Design To Work Was A Gentle Sanding, I Spent A Week Designing My Own. The Original Still Works Better Than This One, Nevertheless, I Thought I'D Share.)
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