Science, unlike other academic fields, is not just a body of knowledge but also a methodology for discovering and classifying knowledge. The scope of science encompasses all physical phenomena, but there is more for scientists to study than the material world and natural processes.
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The human mind, considered by some materialists, to be completely determined by natural processes, has what philosophers call ''[[free will]]''. That is, we human beings can decide to believe or not to believe, to perform an action or not to perform it (see Stephen Covey's "Habit #1: [[Be proactive]]").