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In real life, you never have to stop to consider whether, for example, the failure of gravity to operate as expected is a possible explanation for some problem. In the realm of computers and software, you’re dealing with abstractions layered on abstractions, and in order to make progress on the higher-level ones you have to believe in the lower-level ones. But in order to debug things, you have to question all assumptions, at every level, all the time. This is, psychologically, just plain hard. [Jon’s Radio]