Sheldon changes seats at the movie theater and makes sounds at each seat in an attempt to find the sweet spot. An excellent introduction to the acoustic sweet spot.
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.
Flint is interested in Sam and nervously asks her out on a date. To his delight, she accepts. Flint knows that Sam loves Jell-O, so he surprises her with a funhouse made out of Jell-O.