Did you know? Pop. of Dongguan, China (8.22 million people) is 2 x Pop. of Zhengzhou, China (4.12 million people)
Circumference of Pluto (7,230 km)
/fact/circumference-of-pluto
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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.