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![VIDEO] 'Big Bang Theory' Season 12: Kal Penn, Sean Astin Scene | TVLine](https://tvline.com/wp-content/uploads/2019/01/big-bang-theory.png "VIDEO] 'Big Bang Theory' Season 12: Kal Penn, Sean Astin Scene | TVLine")
VIDEO] 'Big Bang Theory' Season 12: Kal Penn, Sean Astin Scene | TVLine
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The Big Bang Theory Season 12, Episode 21, Recap: Amy and Sheldon Are One Step Closer to the Nobel
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The Big Bang Theory Season 12, Episode 21, Recap: Amy and Sheldon Are One Step Closer to the Nobel
