‘Zoo Hypothesis’ May Explain Why We Haven’t Seen Aliens

'Zoo Hypothesis' May Explain Why We Haven't Seen Aliens

     Ask your friends why scientists have failed to find extraterrestrials, and you can be sure at least one of them will offer the following answer: Humans are not worthy.
By Seth Shostak

We’re flawed beings. We routinely threaten one other, not to mention other species and the environment. That doesn’t sound very civilized, and it offers a plausible explanation for the lack of alien contact. Perhaps the extraterrestrials know we’re here but don’t want to deal with us — either by communicating or by visiting.

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