Why scientists are sure life exists on other planets like earth..

http://www.theguardian.com/science/2014/aug/04/extra-terrestrial-life-inevitable-planetary-scientist-astronomers

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Enjoy Pooh quotes: A.A. Milne, Winnie-the-Pooh

"To the uneducated an A is just three sticks." 
― A.A. Milne, The World of Winnie-the-Pooh