There's no going beyond it, not with our brains apparently. Imagine, for instance, that you're at the center of a hollow sphere. The distance between you and every point on the sphere's surface is ...

For a Dyson-like hollow sphere of infinitesimally small mass, the shell-restricted three-body problem reveals similar ...

His design was a sealed caldron of water was placed over a heat source. As the water boiled, steam rose into the pipes and into the hollow sphere. The steam escaped from two bent outlet tubes on the ...

but rather than just split the sphere right down the middle, [Dave] makes two hollow C-shaped sections, like a tennis ball. This structure allows the halves to be printed in vase mode, which ...