[s12e17] The Conference Valuation Page

Sheldon and Amy use the children to test cognitive and motor skills, much to Howard's amusement and Leonard's distress.

Back at home, Howard is left alone with the kids and invites the guys over for company. The day takes a turn when Sheldon finds a book on developmental experiments for children. [S12E17] The Conference Valuation

In episode " The Conference Valuation " (S12E17), the story splits between a high-stakes pharmaceutical convention in San Diego and a chaotic "science day" back in Pasadena. The Pharmaceutical Convention Sheldon and Amy use the children to test

Bernadette eventually fights to keep her, and Penny declines the rival offer, though Bernadette secretly keeps a napkin with Danny's high-salary offer hidden from Penny. The "Guinea Pig" Day In episode " The Conference Valuation " (S12E17),

Danny offers Penny a job, leading her to realize she doesn't always feel appreciated by Bernadette.

Watch Penny's masterful drug-pushing pitch at the convention:

It is revealed that Amy intentionally brought the book to spark Sheldon's interest in having their own children—a plan that seemingly works as Sheldon begins discussing the logistics of having triplets or quintuplets.