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Duration of Roman Republic (482 y) is 40 x Length of the Napoleonic wars (12 y)
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Estimated population of Red Kangaroo (2011) (11.5 million individuals)
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.