An award winning interactive tour of quarks, neutrinos, antimatter, extra dimensions, dark matter, accelerators and particle detectors from the Particle Data Group of Lawrence Berkeley National Laboratory.

Scientific American review: "Berkeley National Laboratory's particle physicists have created an accessible, entertaining primer on, as they describe it, what the world is made of and what holds it together. Nine sections address these fundamental questions and explore related topics, such as how researchers collect and interpret particle data, and how particles decay into other particles. One not-to-be-missed chapter covers unsolved mysteries, delving into supersymmetry, string theory, dark matter, and the possible existence of extra dimensions. Other features include particle physics news and a page of links to other particle physics education sites."
http://www.particleadventure.org