Did you know?
Highest ascent by a propellor-driven aircraft (2001) (29.52 km) is 5 x Height of Mount Kilimanjaro (5.89 km)
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Length of the Danube River (2,880 km)
If this was a standard unit ...
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.