Welcome to the inaugural episode DeepAstronomy podcast!
Some links for further reading:
http://mason.gmu.edu/~rhanson/greatfilter.html
http://www.nickbostrom.com/
http://www.nickbostrom.com/extraterrestrial.pdf
http://www.scientificamerican.com/article/if-there-are-aliens-out-there-where-are-they/
http://arxiv.org/abs/astro-ph/9901322
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