From the National Institute of Standards and Technology. Provides values for physical constants, as well as spectra, x-ray and gamma ray data, nuclear physics data, condensed matter physics data, and more.
The site presents all 13 volumes published to date by the editors of the Einstein Papers Project, covering the writings and correspondence of Albert Einstein. The volumes are presented in the original language version with in-depth English language annotation, plus an English language translation is available for most documents.
Contains 600 videos of physics experiments available for viewing and downloading. Each video illustrates a particular principle of physics. The demonstrations are augmented by slow-motion photography and animation.