Albert Einstein and Marie Curie, discuss the process of sound and light traveling through air, the splitting of an atom and various other scientific topics.
Obi-Wan talks to Luke about his father's death and explains the Force. While trying to figure out R2-D2, they stumble upon a holographic message from Princess Lea, who pleas for Obi-Wan's help. Luke debates getting involved in the resistance, while Obi-Wan tries to convince him to join.
He describes what sound is verbally and then uses an oscilloscope to "see" it. He goes on to do a DIY experiment to "see" sound using mirror, can, balloon and flashlight.
After visiting Professor Marvel, Dorothy runs back home and finds that a tornado is threatening her house and family. Dorothy returns home and cannot enter the cellar because the barn keepers and her family have locked it. She enters the house, and is knocked unconscious by a shutter that comes loose off of a window in her room. This clip depicts the typical characteristics of a tornado.