  Alternatively, we might define ‘natural facts’ in epistemic terms: as those facts that can only be investigated through empirical methods. Thus, if we accept Metaphysical Naturalism and hold that moral facts are “natural”, this entails Epistemic Naturalism—that moral facts are the kinds of facts that we investigate using empirical methods. Shafer-Landau (2003) defines a ‘natural’ fact in these epistemic terms, and so, because he believes that we can know moral facts by using intuition (which is not an empirical method), he rejects moral naturalism.