“Rationality” is the forward flow that gathers evidence, weighs it, and outputs a conclusion. The curious inquirer used a forward-flow algorithm: first gathering the evidence, writing down a list of all visible signs and portents, which they then processed forward to obtain a previously unknown probability for the box containing the diamond. During the entire time that the rationality-process was running forward, the curious inquirer did not yet know their destination, which was why they were curious. In the Way of Bayes, the prior probability equals the expected posterior probability: If you
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