Seth Shostak Quotes
Are two eyes, four appendages and an upright posture really essential for any creature that can ace the galactic SAT's? Maybe not. In fact, I'd venture that any aliens we ever detect or (less likely) encounter will look quite different than this self-referential stereotype.
Citations
Shostak, Seth. Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence. National Geographic, 2009.
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Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.