Sheldon goes to the store to purchase a new gaming system with Amy
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Howard has a good time hanging out with Sheldon at the bar.
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Sheldon and Howard hang out at the bar in Houston.
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Sheldon has a difficult time with the news that she shares with him.
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Sheldon's mother talks to her son while he visits her in Houston.
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While in Houston, Howard and Sheldon hang out together.
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Howard helps Sheldon accept the new reality at his home.
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Sheldon visits his mother while he's in Houston. He's forced to accept new circumstances.
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TBBT Quotes

Sheldon: Are you still mad about the sperm bank?
Leonard: No!
Sheldon: Do you want to hear an interesting thing about stairs?
Leonard: Not really.
Sheldon: If the height of a single step is off by as little as two millimeters most people will trip.
Leonard: I don't care—two millimeters?! That doesn't seem right.
Sheldon: No, it's true! I did a series of experiments when I was twelve; my father broke his clavicle.

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