The Work Song Nanocluster - S2-E18
Trivia: After Sheldon mentions a molecular sieve, they go over to 4a, their apartment. 4a is a kind of molecular sieve.
The Work Song Nanocluster - S2-E18
Trivia: Penny is the only character whose original surname was never officially revealed (she took Leonard's surname when she married him). That said, a close zoom in on a package she receives in season 2, episode 18, "The Work Song Nanocluster" appears to show her surname as "Teller". The creators have said that was simply a default placeholder prop and was never meant to be legible on screen, so it's not canonically her surname.
Suggested correction: Not being able to afford doesn't necessarily mean he doesn't have the money, especially a man like Sheldon. He works with a budget and he sticks to it. In his budget he has a certain amount set aside for rent, anything more than that and he can't afford it alone.
Nonsense. If he was sticking to a "rigid budget" he wouldn't have even thought of lending a hopeless credit risk like Penny a single cent. Instead he throws a huge bankroll at her without even discussing a repayment plan.
Rubbish, I stick to a strict budget but still have the money to lend to close friends. Like Penny is to him.
He might have different budgets for different things. People could get a higher margin because they could be of more use to the scientific mind of Sheldon.