Aha, more info!
Quoting Conrad>>It's from a discussion perhaps a year and a half(?) ago, about physics: How gravity (and/or other effects) near the surface of an infinitely long (but a few light-years will probably do, to fake it) and very thick and very rapidly spinning "rod" would make you travel backwards in time if you did a close fly-by. (Presumably in the correct direction, wrt the direction of spin.)<<
So it's like a time machine....
Nightowl >8#