[s12e17] The Conference Valuation -

Penny and Bernadette travel to San Diego to promote a new drug. Penny, thriving in her role as a sales lead, catches the attention of Danny, a representative from a rival company that Bernadette despises.

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

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 Penny and Bernadette travel to San Diego to

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