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