Sheldon tries to teach Penny physics so she'll understand Leonard's work; and Wolowitz is jealous when Leonard bonds with his girlfriend.
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Sheldon is humiliated on National Public Radio and vows vengeance on Kripke; and Wolowitz begins a relationship with Katee Sackhoff, who appears in a cameo. Ira Flatow also makes a cameo appearance.
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After the guys, except for Sheldon, go camping, Penny is injured and left with only Sheldon to come to her rescue.
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Leonard and Penny fight, and Sheldon mediates.
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Sheldon tries to teach Leonard the fundamentals of football, while Raj and Howard quarrel over an incident involving kites.
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Sheldon enters a trading-card competition when he hears Wil Wheaton (in a cameo), for whom he harbors resentment, is also participating. Meanwhile, Wolowitz asks Penny to set him up with one of her friends.
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Raj needs to find a new job or he will be sent back to India, so Sheldon hires Raj to work for him. Meanwhile, Leonard and Penny need to explain the "three's company" concept to Howard.
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Sheldon tries to change Penny through behavior modification, using chocolate as motivation. Meanwhile, Howard and Raj try to pick up women at a Goth nightclub.
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Sheldon and Howard consult an entomologist (Lewis Black) to help settle a bet---with their favorite comic books at stake---regarding a species of cricket. Meanwhile, Leonard and Penny try to figure out what's next after an awkward first attempt at intimacy.
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In the third-season opener, Sheldon feels betrayed when his friends alter his arctic-expedition data, so he takes off for Texas. The guys follow him, which kills Leonard's chance for a romantic meeting with Penny.
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