" We’re searching for intelligent, conscious, tool-making beings that have developed a language we’re capable of understanding.We’re searching for intelligent conscious, tool-making, communicative beings that live in social groups (so they can reap the benefits of civilization) and that develop the tools of science and mathematics.
We’re searching for ourselves . . . "

― , If the Universe Is Teeming with Aliens ... Where Is Everybody?: Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life