Watch Penny's masterful drug-pushing pitch at the convention:
Sheldon and Amy use the children to test cognitive and motor skills, much to Howard's amusement and Leonard's distress. [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. catches the attention of Danny
Danny offers Penny a job, leading her to realize she doesn't always feel appreciated by Bernadette. [S12E17] The Conference Valuation
Leonard realizes his mother, Beverly, performed similar experiments on him throughout his childhood. When he calls her to complain, she reveals that the "experiment" on him never actually ended.