Kugel ball

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I’m not a scientist and certainly don’t understand physics.  But I love things like this!

The kugel ball is a perfectly balanced sphere that weighs 5000 pounds yet rotates freely. Pressurized water flowing between the ball and the sphere supports the weight and allows the ball to be easily rotated. Trust me, I don’t understand it!

And, just to note, kugel is German for ball or sphere.