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Perpetual Motion Machine Postcards
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![Item preview, Maxwell's Equations [dark] designed and sold by ThePhysicist R.](https://ih1.redbubble.net/image.51704234.1601/paperpc,450x,w,f8f8f8-pad,600x600,f8f8f8.jpg)
![Item preview, Maxwell's Equations [light] designed and sold by ThePhysicist R.](https://ih1.redbubble.net/image.437501902.1584/paperpc,450x,w,f8f8f8-pad,600x600,f8f8f8.jpg)
