Did you know? Pop. of London, United Kingdom (8.54 million people) is 2 x Pop. of Harbin, China (4.28 million people) Tweet this comparison
Height of the US Presidents' heads carved into Mount Rushmore (18 m)
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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.