Later, Mary finds Sheldon in his room, not doing physics, but drawing a diagram titled "The Emotional Calculus of George Cooper Sr."

Then, Mary. She’s praying in the living room. Sheldon whispers, "Mom, are you communicating with an invisible entity? I’d like to document its responses." Mary sighs, turns off the camera, and says, "Sheldon, not everything needs a control group."

Mary smiles and sits beside him. "That’s not a bug, honey. That’s the whole point."