Carl Sagan Quotes
But I could be wrong.
Sagan, Carl. The Demon-Haunted World: Science as a Candle in the Dark. Random House, 1995, p. 27.
Few politicians publicly admit that they do not know something. This was a common Rumsfeld response. What is more, he was very certain of the fact.
Carl Edward Sagan was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, and science communicator. His best known scientific contribution is research on extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. Sagan assembled the first physical messages sent into space: the Pioneer plaque and the Voyager Golden Record, universal messages intended to be understood by any extraterrestrial intelligence that might find them.