For almost 15 years, CU Boulder and other partners have been developing a one-of-a-kind curricular resource for K-12 educators to teach engineering. The online library is called—you guessed it—TeachEngineering.org, and it offers more than 1,550 free, hands-on, design-focused, classroom-tested lessons aligned with national and state STEM standards. Now, a new partnership with the National Academy of Engineering is expanding opportunities for teachers to collaborate and share advice related to using these hands-on lessons—with the goal to ultimately improve youth STEM education nationwide.