 There is also a more general reason why Williamson’s method for modal knowledge should be reliable. Williamson stresses that knowledge of counterfactuals is pervasive for human decision-making, planning, and theory construction in science (2007). In his (2016) he further conjectures that imagination as a source of knowledge might even have given us an evolutionary advantage as a species, as opposed to being a mere accidental byproduct of our evolutionary history. Thus, insofar as modal knowledge proceeds via the reliable method of counterfactual development in imagination, we should also rest assured that we will get at the right answers concerning matters of metaphysical modality. (Note that this may offer an answer against Nozick’s 2001 evolution-based skepticism about our knowledge of metaphysical modality).