Clothing from The Large Hadron Collision

The Large Hadron Collision

'The Large Hadron Collision' - Season 3, Episode 15

When Leonard gets the opportunity to visit CERN's Large Hadron Collider in Switzerland, he must decide who to take with him as he's only allowed one guest. Leonard plans on taking Penny but faces immense pressure from Sheldon to take him.

Air Date: February 8, 2010.

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