Take a weeble, run it through a Minecraft filter, build it almost entirely of open air, and what have you got? It’s called a Bille, and as a monostable tetrahedron – that is, a four-sided shape that ...
A four-sided shape that will always come to rest on the same side no matter what side it starts on has been built by mathematicians, decades after it was first proposed to exist. Mathematicians have ...
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