This award-winning site from the Particle Data Group at Lawrence Berkeley National Laboratory abounds with information on particle physics. Featuring interactive tours of quarks, neutrinos, antimatter, extra dimensions, dark matter, accelerators, and particle detectors, the content can be read in 16 languages, including Chinese, Norwegian, and Czech. From the homepage, navigate to one of five main categories - The Standard Model, Higgs Boson, Accelerators and Particle Detectors, Exploring Unsolved Mysteries, and Particle Decays and Annihilations. Within each of the five categories, scroll through interactive slide shows to beef up your knowledge of everything subatomic.