Did you know?
Height of Niagara Falls (57 m) is about as big as Height of the Leaning Tower of Pisa (56.7 m)
Tweet this comparison
Forest in Spain (2011) (186,000 km^2)
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.