The Big Bang Theory

Season 3 Episode 15

The Large Hadron Collision

21
Aired Monday 8:00 PM Feb 08, 2010 on CBS
7.7
out of 10
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413 votes

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Leonard faces a dilemma in choosing between Sheldon or Penny to accompany him to Switzerland to see CERN's Large Hadron Collider on Valentine's Day.

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