Physics
- PhysLink: Physics and Astronomy Online Education and Reference
- PhysicsWeb - Web Links
- Fundamental Physical Constants (NIST)
- arXiv.org e-print archives -- Cornell University
- Preprints and Working Papers -- Links provided by Stanford University
- NASA Astrophysics Data System
- McGraw-Hill Dictionary of Scientific and Technical Terms
- Online Medical and Science Dictionaries from MedBioWorld (links to many online dictionaries)
- science.gov -- U.S.
government science and technology databases