This clip details the construction of an acoustic guitar. Throughout the process, it explains how specific building materials and the manner in which the components are put together affects the pitch and sound quality of the guitar.

Dwight is faced with the task of pitching to a female demographic, and despite his co-workers' attempts to help, he remains inflexible and untrainable.

Fiberglass and polymers are the main materials used to make skiis. Engineers design these skiis to create the right flexibility and rigidity required to ski according to regulation but also safely and as fast as possible.

Sheldon tells Penny that he is still interested in String Theory because it is elegant. He gives a brief explanation of it and states that scientists have been working on it for decades.

Grover explains and demonstrates the concept of force by pulling a rope. He also illustrates how to influence force by inviting friends to pull the rope with him.