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On this note, you all should buy and read Death From the Skies! by astronomer Dr. Phil Plait. Every chapter, he provides a scenario for how the world as we know it would end by some astronomical event, how devastating it'd be from facts and numbers using his astronomical knowledge on the...

That would be the Ordovician Extinction Event, if I recall correctly? The one where all of the trilobytes were zapped? I think that's the prevailing hypothesis, and it makes sense.

GRB's are awesome. Terrifying, but awesome. If one went off 25 light years from us, and we were right in the middle of the beam, the resulting energy would be like detonating a 1 megaton nuclear warhead over every square kilometer facing the beam. Some are so far away, like billions of light...