General Relativity
Ackerman's Take on Crease's Treatment of the Equation:
Web Resources:
Here is a good paper on the implication of general relativity and another with more math.
Here is similar information in a presentation format.
Demonstrations of the Equation:
These files will open using Mathematica Player, a free program that can be downloaded here.
Two ideas arising from general relativity are curved spacetime (as opposed to Newtonian gravity) and the expanding universe. Demonstrations fo these ideas are
Gravitation Versus Curved Spacetime
Find These in Your Library:
Main, P. (Nov 2005). General relativity. Physics Review, 15(2), 30-4.
Rennie, G. (May 2005). Applying Einstein's theories of relativity. Science & Technology Review, 4-11.
Video: