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But that doesn't mean your model is worthless. Surely we all have the experience of writing a large piece of code and having it work on first try.
Due to nuclear tests being banned, new designs of nuclear warheads are being developed entirely via simulations -- which works (probably?) because our model of physics is pretty reliable.
Here's hoping we never find out how valid these models are.
I think the assumption is that no one gets fired when the models turned out not to be valid.
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