Sheldon attempts to befriend Kripke in order to use his super computer at work. As a result, Sheldon is forced to go rock climbing and isn't too happy with the height.
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Wolowitz teaches Sheldon Mandarin so he can correctly order his Chinese food to make sure he gets tangerine instead of orange chicken. Makes sense to us.
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Penny tries to organize a surprise party for Leonard with his friends Sheldon, Howard and Raj.
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Penny makes Sheldon go to a computer store to pick out a gift for Leonard for his birthday but he ends up very distracted.
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A picture of Sheldon and his twin sister Missy (Courtney Henggeler) who definitely seems to have gotten the looks of the family.
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The guys gather round Leonard as he sits in his time machine which arrive. The time machine is, of course, the prop from the 1960 movie that he bought off ebay.
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Sheldon has a nightmare in which the Morlocks attack him when he uses his time machine from the 1960 movie.
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The boys gather around Leonard as he gets the winning bid on the time machine from the 1960 movie <i>The Time Machine</i>.
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Even Wolowitz becomes jealous of the 15 year old prodigy Dennis Kim in the episode of The Big Bang Theory, "The Jerusalem Duality."
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Leonard and Sheldon stand behind the 15-year-old science prodigy Dennis Kim (Austin Lee), who is about to prove to the guys he's smarter than them.
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Leonard and Sheldon meet Dennis Kim, a 15 year old childhood prodigy that makes them question their intelligence, especially Sheldon.
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Being the little nut job that he is, Sheldon runs a few tests after Penny comes back from Nebraska with a cold.
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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon