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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.
Directed by: Mark Cendrowski - Chuck Lorre - Bill Prady - Lee Aronsohn
Writer credits: Chuck Lorre - Bill Prady
Cast: Johnny Galecki - Jim Parsons - Kaley Cuoco - Simon Helberg - Kunal Nayyar
AKA: The Big Bang Theory, The Celebration Reverberation, Теорiя великого вибуху, Agymenők, TBBT