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S02E20

The Hofstadter Isotope

• 20:00 • CBS

• 2009-04-13

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. The Big Bang Theory stars and .

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