exact origins are unknown, but fisher's deduction is a maxim or meme found in usenet and other online discussions, similarly to godwin's law
the more issues a person crudely shoehorns down into a liberal/conservative dichotomy, the more certain you can be that the person is an american
"exact origins are unknown, but fisher's deduction is a maxim or meme found in usenet and other online discussions, similarly to godwin's law" What is the definition of "fisher's deduction"?