Umpteen years ago, James P. Hogan wrote a book in which a scientist sent messages back in time using "tau" radiation to stop a project he was working on himself. The book was "Thrice Upon a Time". Very good book by a very good writer (until he stopped writing SciFi and started with political thrillers).

>Tracy,
>
>I'll have to dig up the name of the book I read in the last couple of years, the premise was the Texas super collider project went online and the particle emissions became a beacon for a rather nasty alien race to come take over the planet.
>
>> perhaps a time-traveling bird was sent from the future to sabotage the experiment. ... latest in a series of physics research projects whose purposes are so unacceptable to the universe that they are doomed to fail, subverted by the future.
>>