We know long, traditional lectures aren’t effective. Learners need to interact with the material, not just listen to it. The University of Colorado Boulder has taken hands-on learning to a whole new level with its highly interactive science and engineering courses that involve learning concepts by getting up and doing them, such as physically participating in a demonstration of angular momentum. How does CU Boulder do this? They rely heavily on Learning Assistants: paid, trained undergraduates who help their peers learn by facilitating labs, demonstrations, and small group discussions. Research shows that the Learning Assistants not only help students improve their understanding, but professors improve their own teaching methods by mentoring Learning Assistants. Read on to discover the impact of the LA program at other universities, how it builds the pipeline of science teachers, and how CU Boulder aims to change the image of science education.