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In the deepest sense the search for extraterrestrial intelligence is a search for ourselves.

Carl Sagan
Moon, Extraterrestrial, Star Gazing
Carl Sagan, Jerald F. TerHorst, Allan J. Mayer, Sharon S. McKern, Laurence J. Peter (1980). “Broca's brain: reflections on the romance of science”
In the deepest sense the search for extraterrestrial intelligence is a search for ourselves.