> If we lived in a nonorientable world, these chemicals would be indistinguishable. True, but you might have to move such a molecule arbitrarily far ("all the

> If we lived in a nonorientable world, these chemicals would be indistinguishable. True, but you might have to move such a molecule arbitrarily far ("all the way around the Mobius strip") in order to change it from one enantiomer to ther other.