In science, a theory is an explanation. Where a law is a pattern that natural phenomena follow. So they're two different things. A law is great for predicting events, because we expect the events to follow the pattern. But the law won't explain why events follow the pattern. For that we need a theory. Both theories and laws can turn out to be wrong, and must be tested by considering what evidence we should find if the theory or law were false, and then looking for such evidence.
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