The core difference between B and F is what they mean by "probability." If you go to the casino, the Bs and the Fs will interpret everything the same way, but when you go to the stock market, the Bs and the Fs will want to use their language differently. It seems likely to me that most of the uncertainties that show up in everyday life are things that Bs would be comfortable assigning probabilities to, but Fs would be hesitant about.
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