Watch The Big Bang Theory Season 1 Episode 9 online via TV Fanatic with over 5 options to watch the The Big Bang Theory S1E9 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.
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After cleaning up after an internet experiment, Leonard discovers a letter in the trash can inviting the roommates to present some research they've done to a physics conference.