Did you know? Height of the Tres Hermanas waterall in Peru (914 m) is 1 thousand x Height of a tennis net at the centre (914 mm) Tweet this comparison
Diameter of Mercury (4,880 km)
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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.