A Whisperpedia reading about Roller Coasters - includes their history, physics, safety, and different types. 

http://media.blubrry.com/sleepwhispers/sleepwhispers.files.wordpress.com/2018/11/146sw-whisperpedia-roller-coasters.mp3

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Resource for this episode: Wikipedia article, "Roller Coaster" (content use licensed via CC BY-SA 3.0)