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Time since the end of the Cambrian geologic period (485 million y) is 250 thousand x Time since start of building of the Colosseum (1,945 y)
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Forest in Italy (2011) (94,600 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.