Once upon a time, there was a boy who cried, "there's a 5% chance there's a wolf!" The villagers came running, saw no wolf, and said "He said there was a wolf and there was not. Thus his probabilities are wrong and he's an alarmist." On the second day, the boy heard some rustling in the bushes and cried "there's a 5% chance there's a wolf!" Some villagers ran out and some did not. There was no wolf. The wolf-skeptics who stayed in bed felt smug. "That boy is always saying there is a wolf, but there isn't." "I didn't say there was a wolf!" cried the boy. "I was estimating the probability at low, but high enough. A false alarm is much less costly than a missed detection when it comes to dying! The expected value is good!" The villagers didn't understand the boy and ignored him. On the third ...
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