Did you know?
Duration of Toltec Empire (626 y) is 25 x One average human generation (25 y)
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Forest in Brazil (2011) (5.27 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.