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I was reading a book on forensic archaeology a few months ago and was interested in pages 86 and 87 where it discusses the scientific method. The folowing is from page 87, but the whole piece is worth reading:
Eventually, over much time, with precise testing marked by a failure to falsify, scientific theories can become scientific principles.
I think that explains better how well established theories such as evolution are approached in the scientific world. Evolution is more than a "just a theory", it is a principle. Scientific principles are still theories, it's just that some are so well established that the basic fundamentals for all intents and purposes need no further investigation. Populations evolve over successive generations - fact - and this principle is the foundation of biological processes.