Still, the argument "either A has happened or it has not happened" is silly. What matters is the knowledge we base our decisions on (ultimately we don't even kn

Still, the argument "either A has happened or it has not happened" is silly. What matters is the knowledge we base our decisions on (ultimately we don't even know the outside world really exists, we only have a set of measurements and infer the existence of an outside world from that), and sometimes that is only partially certain.