http://mobile.nytimes.com/2016/06/12/opinion/sunday/yes-there-have-been-aliens.html
"Specifically, unless the probability for evolving a civilization on a habitable-zone planet is less than one in 10 billion trillion, then we are not the first."
http://mobile.nytimes.com/2016/06/12/opinion/sunday/yes-there-have-been-aliens.html
"Specifically, unless the probability for evolving a civilization on a habitable-zone planet is less than one in 10 billion trillion, then we are not the first."
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