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Mass of all the Earth's biomass (560 trillion kg) is 2.5 thousand x Mass of water in Ullswater (English Lake District) (223 billion kg)
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Duration of Toltec Empire (626 y)
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.