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Description by couchtuner for The Big Bang Theory Season 9 Episode 18 : Leonard, Sheldon, and Wolowitz run into problems when they file for a patent for their infinite persistence gyroscope. Also, Penny, Amy and Bernadette give Koothrappali dating advice when Emily reaches out to him after their breakup.
Watch It Here : The Big Bang Theory Season 9 Episode 18 The Application Deterioration