I think these things happen all the time and we don't even know about it. The Big One may or may not come in our life time but we can't truly predict Mother Nature. I keep going back to that George Carlin video that ProfessorM posted. He says we are just a flea on the back of a dog and soon enough we will all be shaken off. He's right, this earth has been around for much longer than humans have walked it.
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