On: How one-sided objects like a Mobius strip work

[avip]

In a non-orientable world, we would not have lived to enjoy the confusion between medicine and illegal drugs - we would die from our inability to consume L-sugars thanks to our entire glycolysis cycle being 100% D-oriented.

[rtkwe → avip]

It's a bit anthropic but if humans had evolved on a non orientable universe that wouldn't be a problem.