Most STEM education reforms aim to prepare learners to use science in their post-school daily lives. This goal is not about content – reproducing correct science facts is not sufficient to solve practical problems of real people. However, even in classes structured by reformed curricula, students are often permitted to construct knowledge only insofar as it aligns with canon. Here, we argue that the tension between reproducing “correct” ideas and constructing one’s own ideas is exacerbated by - and partially arises from - our approach to designing and refining curricula.