Roller coaster engineer Korey Kiepert joins WIRED to answer the internet's burning questions about roller coasters and the people who design them. How do roller coasters work? Who invented the first roller coaster? How are roller coasters tested? What the tallest and fastest roller coaster in the world? How do they stay on the rails while looping and speeding down the track? Engineer Korey Kiepert answers each of these questions plus plenty more on Roller Coaster Support.