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Circumference of Earth's Moon (10,920 km) is 2.5 x Length of the Mekong River (4,350 km)
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Land used for agriculture in Chad (2011) (510,000 km^2)
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.