Motivated by the work of Hardwig (1985, 1991) on epistemic dependence and trust in expertise, we enquire into the nature and extent of the critical assessment that non-scientists can make—and that they should be taught to make—with regard to science. Our thesis is that critical assessment of science is possible for non-experts because at the basis of science is a set of norms, beliefs and values that are contestable by non-scientists. These norms, beliefs and values are of critical importance to science education and valuable to explore from a pedagogical perspective.