QED 这书读得我真的很想去看那本 Reasoning about Uncertainty... 那本 Introduction 里的引言就很吸引我：
"When one admits that nothing is certain one must, I think, also admit that some things are much more nearly certain than others. It is much more nearly certain that we are assembled here tonight than it is that this or that political party is in the right. Certainly there are degrees of certainty, and one should be very careful to emphasize that fact, because otherwise one is landed in an utter skepticism, and complete skepticism would, of course, be totally barren and completely useless."
— Bertrand Russell, Am I an Atheist or an Agnostic?