[color=#000000
ost_uid0]I actually read a Gregory Benford novel called [i
ost_uid0]Timescape[/i
ost_uid0] that was all about people changing the past to prevent a global disaster by sending messages back using nutrinos or something. The explanation for getting round the paradox that might have ensued was actually very good and made sense - it was quite Trousers of Time-ish though.[/color
ost_uid0]