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Scientific theory
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==Types== [[Albert Einstein]] described two different types of scientific theories: "Constructive theories" and "principle theories". Constructive theories are constructive models for phenomena: for example, [[Kinetic theory of gases|kinetic theory]]. Principle theories are empirical generalisations, one such example being [[Newton's laws of motion]].<ref>{{cite book|url=https://plato.stanford.edu/archives/fall2017/entries/einstein-philscience/|title=The Stanford Encyclopedia of Philosophy|first=Don A.|last=Howard|editor-first=Edward N.|editor-last=Zalta|date=23 June 2018|publisher=Metaphysics Research Lab, Stanford University|via=Stanford Encyclopedia of Philosophy}}</ref>
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