Seth Shostak Quotes
It's the default premise in science: If you observe something in nature only once, you assume that what you've seen is typical. That's because 'typical' is just another way of saying 'most probable.'
Citations
Shostak, Seth. Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence. National Geographic Books, 2009.
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Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.