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Originally Posted by RandyWayne
But then you wouldn't be around to pray that your grandfather would die, which means he would most likely live.
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Doesn't matter. In the new timeline, grandpa's dead and you're never born. The paradox is really only a problem for time travelers, not for retro-prayer-warriors. But, even in that case (time travel), the solution is pretty simple: the universe splits in two whenever someone travels to the past. One half is the "original" time line, where grandpa lives and you are born and do the time-travel -- it continues from there without you (since you left the timeline to go back), and the other half where grandpa dies and you are never born.
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If Montgomery Scott gave the formula for transparent aluminum to present day scientists because he knew how to make it in the future, and thus assumes credit for having invented it. Who actually sat down and figured it out originally?
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Another Back to the Future scenario! Like Doc going back and telling himself about the flux capacitor, and Marty bringing rock and roll to the fifties.
