As applications of AI have proliferated, the call has grown for educating students about what AI is, how it works, and how it can affect us. In response, [an American University], in collaboration with an external implementation partner, developed 12 modular, short-format curricula for educators of students aged 5-18 years to use for developing AI literacy among students. The curricula incorporate the National Research Council’s core ideas of engineering design. This article describes the curricula, how they were implemented in 2022-23, and findings from an external evaluation on the impact of this AI literacy initiative. In survey responses and interviews, teachers reported that both they and their students gained knowledge about how AI works, key AI concepts, current uses of AI, and potential benefits and harms to society. In addition, learning more about AI increased their levels of optimism about the potential benefits of AI to society and about their own abilities to contribute to shaping the future of AI. The reported impact is impressive given how little time students engage in the curriculum content relative to other topics and subjects they study.