Penny asks Sheldon for advice on whether or not she should date Leonard, and during the conversation, Sheldon corrects her use of physics terms. He then explains the Schrödinger's Cat thought experiment to help her think about the situation.
Sheldon is in the car on a road trip with his dad and brother. They are talking about roadkill, and his dad asks if it's alive or dead if it's still twitching. Sheldon mentions that it sounds like Schrodinger's Cat and explains the theory.
Penrose describes his black hole theory, which sparks an idea in Stephen's mind. Stephen reverses Penrose's theory and develops one of his own. Stephen suggests that the universe was born from a black hole exploding. The black hole has such strong space-time singularity that nothing can escape from it, even light. The black hole is triggered by the collapse of a star.