Off Topic — HabitableZone

Off Topic » in reply to Dr. Sagan

The Quote

"Extraordinary claims require extraordinary evidence."

More Carl Sagan quotes here:

http://en.wikiquote.org/wiki/Carl_Sagan

And going along with this thread, I highly recommend one of his last books,
The Demon-Haunted World: Science as a Candle in the Dark.

http://www.csicop.org/si/2007-01/sagan.html

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