Did you know? Time since the first passenger steam railway service (199 y) is 2.5 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)
Height of Kingda Ka, highest roller coaster (139 m)
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Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.