The new trivia thread.

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What are calculated with this formula?

The roots of a quadratic equation. The equation takes the form of ax² + bx + c = 0. Most students spend the majority of tenth grade math solving quadratic equations, and then never do so again during the remainder of their lifetime.
 
What was noteworthy about the way Eddie Phillips of the Mod band The Creation played guitar?

He used a violin bow, later copied by Jimmy Page of Led Zeppelin. This clip is from episode 17, (February 25, 1967), of the German music show Beat-Club. Phillips uses the bow from approximately 1:20.

 
What 3D science fiction film, directed by Francis Ford Coppola, and starring Michael Jackson, was exhibited only at Disney theme parks from 1986 through the 1990s?
 
What 3D science fiction film, directed by Francis Ford Coppola, and starring Michael Jackson, was exhibited only at Disney theme parks from 1986 through the 1990s?

Captain Eo.