Did you know?
Diameter of Jupiter (139,800 km) is 20 x Length of the Amazon River (6,990 km)
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Height of the Hoover dam wall (221.4 m)
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.