The University of Colorado Boulder continues to update the interactive science simulations on the PhET website. These free sims are excellent ways to expose students to often complicated topics in new ways. The site was originally designed to deliver physics simulations and virtual labs, but they now offer all kinds of tools for chemistry, biology, graphing, and other math/science topics. I recently discovered the teacher resources, that include lesson plans, handouts, and assessments that help teachers better integrate these simulations into their classrooms in a meaningful way. Users can upload their own activities or documents, and as they are reviewed, the best ones are given “gold star”, high quality status.