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The Hofstadter Isotope
CBS
The Hofstadter Isotope (S02E20) is the twentieth episode of season two of "The Big Bang Theory&... More The Hofstadter Isotope (S02E20) is the twentieth episode of season two of "The Big Bang Theory" released on Mon Apr 13, 2009. Over 8,304 TV Time users rated it a 7.98/10 with their favorite characters being Jim Parsons as Sheldon Cooper, Kunal Nayyar as Rajesh Koothrappali and Kaley Cuoco as Penny.
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