Are humans unique to the universe? This is a question being asked by SETI, the Search for Extraterrestrial Intelligence. http://www.seti.org/site/apps/nl/content2.aspc=ktJ2J9MMIsE&b=194993&ct=221048 [Broken] It has been argued that the human organism is a unique product of the universe. The conditions and criteria for the emergence of a human population are so rare and seemingly unrepeatable in the universe that humans are thought by some to be a one time affair. Could there be approximations that come close to a human organism elsewhere in the universe? What would be some of the predominant features of such an organism?