Pictures of the Hydrogen Atom - 3D visualization of the orbitals and transitions of the hydrogen atom. Classical and Quantum Gravity - An online journal containing new research on quantum gravity, many articles are free to the public. Examples in Quantum Mechanics - Some examples of quantum mechanics and the Mathematica code that generated them. Knocking on the Devil's Door - A simple introduction to quantum mechanics in the form of a 38 page PDF text book. How Stuff Works: Teleportation - A fascinating look at a future technology and how it could be used to beam you from one place to another at the speed of light. Visual Quantum Mechanics - Instructional units that introduce quantum physics to high school and college students who do not have a background in modern physics or higher level math using interactive computer programs and digital multimedia in an activity based environment Kronig Penney Applet - Java implementation of a Kronig Penney one-dimensional model's solver. Includes exercises on the subject. High Energy Theory Preprint Server - A collection of research papers on high energy particle physics, and on quantum field theories. Quantum Physics Preprint Server - A collection of research papers on quantum mechanics CompHEP - A standalone program for calculating cross sections of particle scattering in various QFT models. International Journal of Modern Physics A - Started in 1986, IJMPA has gained international journal consisting of reviews and original papers covering the latest research developments in particles physics, field theory, gravitation and cosmology.