Launch Pad, Day Five: Kevin R. Grazier on Fermi and Drake

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The Fermi paradox starts with discussions at the manhattan project. One day when extra-terrestrials came up, Fermi asked, "Where are they?"

Or, expanded, "The apparent size and age of the universe suggest that many technologically advanced extraterrestrial civilizations ought to exist. However, this hypothesis seems inconsistent with the lack of observational evidence to support it." (The wiki on this looks like it might be interesting, so...