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Lifespan of horse (30 y) is 2 x Lifespan of a cat (15 y)
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Pop. of Nanjing, China (8.19 million people)
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.