Other
National Academy of Sciences: Walter Elsasser
A complete biography of Elsasser's life and contributions to both biological science and earth science. Page also contains a photo of Elsasser. Site includes biographies of other famous scientists as well.
Lawrence Berkeley National Laboratory
Berkeley Lab: Basic Nuclear Science Information
Site provides the ABC's of nuclear science including radioactivity and gamma decay to fission and comic rays.
Khan Academy
Khan Academy: Discovery of the Electron and Nucleus
Learn about Thomson's cathode ray experiment and the plum pudding model and Rutherford's gold foil experiment.