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'The Focus Attenuation' - Season 8, Episode 5
When the guys want to spend the weekend working on science projects, the girls opt for a weekend trip to Vegas. After Penny receives an email from work, Amy and Bernadette accuse her of being a buzzkill. Meanwhile, the guys' efforts to invent something cool fizzle out when they keep getting distracted.
Air Date: October 13, 2014.