I'm getting pretty sick of reading and hearing the clever observation that the insides of your intestines are actually external to your body because the human body is topologically equivalent to a doughnut (or a coffee cup). We know this by now. Just stop.
But it got me thinking: the fact that we have two nostrils as well as a mouth means that the human body is actually equivalent to a coffee cup with three handles. So there.
And don't get me started on the nasolacrimal ducts.
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Oh, and since the fallopian tubes are continuous with the peritoneal cavity, that means we're up to six - but only for women. Men are just five.
so what genus, topographically speaking, are we?
Women are in the same homotopy class as a 6-torus (a coffee cup with 6 handles) and men are in the same homotopy class as a 5-torus.
If only my very nerdy friend would drop in - then we could really nerd up!
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