Dianna Cowern, known to millions of YouTube viewers as Physics Girl (null, shares why she is passionate about physics and how she turned that passion into a career as a science communicator on YouTube. Dianna is a science communicator and educator who received her BS in physics from MIT before researching low-metallicity stars at the Harvard-Smithsonian Center for Astrophysics. Dianna pursued her career in STEM outreach at the Reuben H Fleet Science Center and as a physics outreach coordinator at UCSD. Her work on Physics Girl has been featured on the Huffington Post, Slate Magazine, Popular Science, and Scientific American blogs.