The Osmosis and Diffusion labs in OsmoBeaker™ use simulated molecular-level experiments to explore some of the trickiest concepts for introductory biology students to understand, helping them overcome common misconceptions. These labs use medically relevant examples that allow students to visualize and tinker with the mechanisms underlying diffusion and osmosis. Our National Science Foundation funded research shows that students understand these critical processes better after using OsmoBeaker™ (Meir, et al. 2005) .