Virtual Lab is an important component of Open Classroom. Virtual Lab allows students to interact, perform experiments and simulations visually and intuitively. For example, when learning about cardiovascular structure and activity, in other educational environments, students can study theory only. On Open Classroom, students conduct their own operations, X-rays, and CT scans with Virtual Lab's virtual model as a practicing physician! Don't worry, this lab never causes any accident!
Virtual Lab experiments and images used here are by PhET Interactive Simulations, University of Colorado Boulder, licensed by CC-BY 4.0, https://phet.colorado.edu