There was a young lady named Bright,
Whose speed was far faster than light.
She went out one day,
In a relative way,
And returned the previous night!
The General Relativity Tutorial by John Baez
Lecture Notes on General Relativity by Sean M. Carroll
Relativity on the World Wide Web
Usenet Physics FAQ
Cambridge Cosmology Public Home Page
Stanford Encyclopedia of Philogophy, Time Travel and Modern Physics
Living Reviews in Relativity (online journal)
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