Some Speculations

I. Aliens on Earth

A few months back I was pleased to see a description in print of an idea that’s been kicking around in my brain for a while now: if the earth is so old, why couldn’t there have been other intelligent species before us who have simply gone extinct, vanished without a trace, their fossils erased by the epochal movement of the continents? I mentioned this to a friend over beer and he raised the objection that some trace of these creatures would surely have remained for us to find; look at the extent to which we’ve transformed our environment in ways that won’t disappear for an extremely long time. Continue reading

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