arXiv. Open access site where physicists communicate about their research. arXiv is an e-print service in the fields of physics, mathematics, non-linear science, computer science, quantitative biology, quantitative finance and statistics.
The physics classroom. Tutorials and modules, hosted by Compadre.
United States Geological Survey.
Jet Propulsion Laboratory (California Institute of Technology). JPL has 24 spacecraft and 10 instruments conducting active missions, including Curiosity exploring Mars.
Fuck Yeah Fluid Dynamics Are cats a fluid? What caused the Boston Molasses Flood?