 In order to understand the scope of science and religion and their interactions, we must at least get a rough sense of what science and religion are. After all, “science” and “religion” are not eternally unchanging terms with unambiguous meanings. Indeed, they are terms that were coined recently, with meanings that vary across contexts. Before the nineteenth century, the term “religion” was rarely used. For a medieval author such as Aquinas, the term religio meant piety or worship, and was not applied to religious systems outside of what he considered orthodoxy (Harrison 2015). The term “religion” obtained its considerably broader current meaning through the works of early anthropologists, such as E.B. Tylor (1871), who systematically used the term for religions across the world. As a result, “religion” became a comparative concept, referring to traits that could be compared and scientifically studied, such as rituals, dietary restrictions, and belief systems (Jonathan Smith 1998).