Did you know?
Circumference of Mercury (15,330 km) is 5 x Length of the Rio Grande (USA, Mexico) (3,057 km)
Tweet this comparison
Length of a BIC Cristal pen (149 mm)
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.