The Pythagorean cup is an interesting thing to read about, and now you can 3d print it! Pythagoras was known for his theorem, but, don’t forget, he had a cup that siphoned wine onto your lap!
Read about it and the scientific principle here:
https://en.wikipedia.org/wiki/Pythagorean_cup
Devious Pythagorean Cup by jsteuben
http://www.thingiverse.com/thing:123252
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