Sheldon helps Penny with her new business - The Big Bang Theory

Penny's new business is not optimized enough for her to maximize profit according to Sheldon.

Trivia
This is the first episode where just the main cast appear and no guest actors or extras are used.

This episode took place in only three locations (Apartment 4A, Apartment 4B, and the hallway), the least of all the episodes in the series.

Penny is seen wearing the Penny Blossom in the next episode. She later wears one to Howard and Bernadette's wedding in "The Countdown Reflection" (S5E24)
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S02E18 - The Work Song Nanocluster