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: The employment agency worker who sarcastically deals with Sheldon is played by Yeardley Smith , the long-time voice of Lisa Simpson on The Simpsons .
: Inspired by Albert Einstein’s time in a patent office, Sheldon decides he needs a menial job to clear his mind. He eventually "hires" himself at The Cheesecake Factory, much to Penny's annoyance.
: While Sheldon loses his mind, Leonard, Penny, Howard, and Bernadette go on a double date to a disco roller rink—an idea originally from Raj, who ends up feeling left out. Fast Facts Original Air Date : February 1, 2010.
In this fan-favorite episode, Sheldon experiences a severe case of "physicist's block" while trying to figure out why electrons behave as if they have no mass when traveling through graphene.