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For Science Fiction writers, and perhaps others as well, this appears to be a good source for understanding Relativity and other theories about space/time:

While you browse that site, here's your soudntrack (Hawkwind, Quark Strangeness & Charm):

Einstein was not a handsome fellow
Nobody ever called him Al
He had a long mustache to pull on, it was yellow
I don't believe he ever had a girl
One thing he missed out in his theory
Of time and space and relativity
Is something that makes it very clear
He was never gonna score like you and me
He didn't know about
Quark, Strangeness, and Charm