NASA Why? Files video containing the following nine segments. NASA Why? Files segment involving students in an activity studying circuits and how the different types and combinations of circuits work. NASA Why? Files segment exploring lightning and the different types of electrical charges. NASA Why? Files segment exploring the basics of electrical circuits. NASA Why? Files segment explaining the forms of electricity and the many sources of power. NASA Why? Files segment exploring the history of electricity with Dr. Textbook. NASA Why? Files segment explaining lightning and how it works. NASA Why? Files segment exploring circuits in more depth. NASA Why? Files segment exploring the Niagara Power Project and how it works. NASA Why? Files segment explaining power companies and what public damage is.