Welcome to Good News Fridays. Each week, this post features something good, wholesome, positive, and overall something great. We all need something good to read or watch on Fridays!

In this edition of “A World of Difference” from WIRED, Korey Kiepert, owner and engineer with The Gravity Group, goes through the 8 main types of roller coasters and breaks down how they work as well as the decisions behind why they get built in the first place. Korey explains the difference between a giga coaster and a strata coaster, as well as what separates a “wild mouse” from a “mine train.”

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