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A very cool and fun piggy bank. Interplay between potential energy of gravity and conservation of angular momentum. A simulation of a decaying orbit. A fun way to save your coins. Vortex Coin Piggy Bank Video: Buy it! 🇨🇳 AliExpress 🇺🇸 Amazon.com 🇬🇧 Amazon.co.uk 🇩🇪 Amazon.de