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The idea that all current mysteries will eventually be solved using the scientific method has been called scientism. Stephen Barr describes scientism as the notion that “all objectively meaningful questions can be reduced to scientific ones, and only natural explanations are rational.” In biology, a subcategory of scientism is evolutionism, the concept that all biological questions (including those concerning the nature of humankind) are reducible to explanations derived from the Darwinian theory of evolution by natural selection.