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Hitchhiking through the Galaxy
The Universe is just too darn big for intelligent life to occur only once--although because it is so big, the chances of actually meeting that other life seems rather slim. Then again, in the Hitchhiker's series, Douglas Adams suggests that because of the vastness of the cosmos, even a universe full of life-bearing planets would still have an effective population of zero. So, I guess we're not really here.
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