Asimov and Hawking on trying to contact alien civilizations

http://www.examiner.com/x-27763-Skepticism-Examiner~y2010m4d23-Was-Isaac-Asimov-right-about-contacting-extraterrestrial-civilizations?cid=examiner-email

http://www.timesonline.co.uk/tol/news/science/space/article7107207.ece#cid=OTC-RSS&attr=797084