* Possibly the [[Theory of Evolution]]. While this is the most popular term for it, science philosopher [[Karl Popper]] asserted that it could be considered a metaphysical research program depending on the definition being used, <ref>The science philosopher Karl Popper famously called Darwinian evolution a "metaphysical research program".</ref> and other science philosophers have called it a scientific law. | * Possibly the [[Theory of Evolution]]. While this is the most popular term for it, science philosopher [[Karl Popper]] asserted that it could be considered a metaphysical research program depending on the definition being used, <ref>The science philosopher Karl Popper famously called Darwinian evolution a "metaphysical research program".</ref> and other science philosophers have called it a scientific law. |