One of the drivers of scientific research is the desire to seeking a greater and greater synthesis, to seek to unify the knowledge and theories of many different areas. One of the most severe constraints that scientists face when developing a new theory is the need for consistency with other theories. It is very easy to construct a theory that explains any single phenomenon. It is much, much harder to construct a theory that does not also lead to problems with other well-established results. If a new theory conflicts with existing theories, something has to give in order to eliminate the contradiction.
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