Post by @cstross@wandering.shop

Mad SF idea: the Hollow Earth theory is semi-correct, except Earth isn't a hollow sphere, it's a Klein bottle.

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@cstross that sounds like one of the weirder Xeelee series stories

@cstross As long as there are still C.H.U.Ds...

A very groß klein bottle 😜

@cstross nothing would surprise me nowadays