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Pop. of Tianjin, China (6.86 million people) is 40 x Estimated world population of Sitatunga (170,000 individuals)
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Height of the US Presidents' heads carved into Mount Rushmore (18 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.