The Big Bang Theory Season 3 Episode 15: The Large Hadron Collision
First aired on Feb. 8, 2010
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Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.
Showing 1 quote.
Sheldon: I believe you know why I'm here.
Penny: I always figured it was to study us, discover our weaknesses, and report back to your alien overlords.