This site, from UCLA's Department of Physics, contains web and in-class demonstrations of physics concepts in the topic areas of mechanics, harmonic motion and waves, electricity and magnetism, acoustics, optics, matter...

These web pages, authored by Nick Strobel, contain material explaining Einstein's general and special theories of relativity. Gravity and warped spacetime are included, along with explanations of the impact on...

This site from the Exploratorium presents a demonstration showing that the acceleration of gravity is the same for different objects. The site contains a materials list, assembly instructions for creating the vacuum,...

An idiosyncratic and personal selection of particularly important or particularly intriguing mathematical equations, not all of them complicated. Mathematical Constants; The definition of Pi; The definition of e; A...

The Gravity Recovery and Climate Experiment (GRACE) mission uses twin satellites to make detailed measurements of Earth's gravity field. GRACE materials include a description of the mission, research projects, and...