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Why We Haven’t Met Any Aliens: Perhaps our current science over-estimates the likelihood of extraterrestrial intelligence evolving. Or, perhaps evolved technical intelligence has some deep tendency to be self-limiting, even self-exterminating. After Hiroshima, some suggested that any aliens bright enough to make colonizing space ships would be bright enough to make thermonuclear bombs, and would use them on each other sooner or later. Maybe extraterrestrial intelligence always blows itself up. Indeed, Fermi’s Paradox became, for a while, a cautionary tale about Cold War geopolitics.
