I might call myself "Buried Alien," but I'm a native terrestrial (or at least, that's what I let you all think).
Anyway, from the same strangely fascinating website where I earlier found an article about wrestling mammoths comes this discussion of the Fermi Paradox, which offers various theories about the reasons that, despite the vastness of the universe, we have yet to come into contact with intelligent extraterrestrial life.
It's a gripping read.
Buried Alien (The Fastest Post Alive!)