Listening for Life

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Is There Anyone Out There? Scientists involved in the Search for Extraterrestrial Intelligence (SETI) are tuned in. But there may be more "sounds" out there than you think: not just radio and tv from humans, but signals from a whole variety of natural sources. Which of the signals in this game do you think sound "intelligent"? Would you recognize another civilization if it called? What kind of message would you send that another species might recognize?