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.
Watch Penny's masterful drug-pushing pitch at the convention: [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 Back at home, Howard is left alone with
Sheldon and Amy use the children to test cognitive and motor skills, much to Howard's amusement and Leonard's distress. The Pharmaceutical Convention Sheldon and Amy use the
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.
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.