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Ucr.edu has 109 URLs listed in 104 Dmoz categories.

Knots and Quantum Gravity
The book "Knots and Quantum Gravity" is the proceedings of a conference held at U.C. Riverside on May 14-16th, 1993. It is now available for free in Postscript format.
http://math.ucr.edu/home/baez/kqg.html
Top/Science/Physics/Quantum_Mechanics/Quantum_Field_Theory/Gravitation

Are There Any Good Books on Relativity Theory?
The Physics FAQs guide to relativity books; by Chris Hillman (with contributions by Nathan Urban). An extensive annotated list of semi-popular books, textbooks and background reading.
http://math.ucr.edu/home/baez/physics/Administrivia/rel_booklist.html
Top/Science/Physics/Relativity

Hawking Radiation
A brief and accessible overview of Hawking radiation from the Physics FAQ; suitable for the general reader. Originally written by John Baez (University of California at Riverside); later modified by Ilja Schmelzer.
http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/hawking.html
Top/Science/Physics/Relativity/Black_Holes/Thermodynamics

General Relativity Tutorial
Highly recommendable collection of interconnected web pages that serve as an informal introduction to general relativity. While some mathematics is used, the focus is on the key ideas. By John Baez (University of California at Riverside).
http://math.ucr.edu/home/baez/gr/gr.html
Top/Science/Physics/Relativity/Courses_and_Tutorials

Physics 7: Relativity, Space-time and Cosmology
Notes, syllabus and exercises for an undergraduate course taught by Jose Wudka at the University of California, Riverside, in 2000. The course itself starts out with Ancient cosmological models before working its way to Newtonian physics, special and gen
http://phyun5.ucr.edu/~wudka/physics7.html
Top/Science/Physics/Relativity/Courses_and_Tutorials

How Do You Add Velocities in Special Relativity?
Here is the formula for adding velocities in special relativity when motion occurs in a single direction.
http://math.ucr.edu/home/baez/physics/Relativity/SR/velocity.html
Top/Science/Physics/Relativity/Special_Relativity

A Special Relativity Paradox: The Barn and the Pole
The answer to the famous barn and the pole paradox is that the two doors are never closed at the same time in the runner's frame of reference.
http://www.math.ucr.edu/home/baez/physics/Relativity/SR/barn_pole.html
Top/Science/Physics/Relativity/Special_Relativity

Time Travel - Fact or Fiction?
Brief overview of physics issues related to time travel, including the question of conversation laws, general relativity, possible paradoxes, and the notion of tachyons. From the Physics FAQ; original by Jon J. Thaler.
http://math.ucr.edu/home/baez/physics/Relativity/GR/time_travel.html
Top/Science/Physics/Relativity/Time_Travel

Experimental Basis of Special Relativity
A summary of tests of the foundations and predictions of special relativity, by Tom Roberts, Siegmar Schleif and others. Part of the Physics FAQ.
http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html
Top/Science/Physics/Relativity/Experiment_and_Observation

Why No 'New Einstein'?
Article by Lee Smolin argues that research programs presently fail to advance science in new directions, and suggests remedies.
http://math.ucr.edu/home/baez/no-new-einstein.pdf
Top/Science/Science_in_Society/Science_and_Technology_Policy