“You have a close friend, Bob,” he explained. “He’s great. You love him. Bob is at a house party where someone gets murdered. No one knows who the murderer is. There are twenty people there. None are criminals. But Bob is less likely in your mind than anyone else to have killed someone. But you can’t say that there is a zero chance Bob killed someone. Someone got killed, no one knows who did it. You now think there’s like a one percent chance Bob did it. How do you see Bob now? What is Bob to you? And there is no updating: there is no new information about Bob.” One answer was that you should
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