Fat Man, from Los Alamos Science Museum
Leona Marshall Libby, image taken at Hanford B Reactor, where the Plutonium for Fat Man was manufactured during the Manhattan Project.
Hyperphysics by GSU
The Physics Classroom
Dynamic Periodic Table
Nuclear Data Center (Chart of Nuclides)
The Particle Adventure
NASA Homepage
The Physics of Baseball
Department of Energy National Labs
Apollo 17 in Real Time
Play Fermi Questions!
Physics Discovery Timeline
Symmetry Magazine
PhET (Physics Simulations) by UC-Boulder