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Time since the end of the Neogene geologic period (2.58 million y) is 500 x Age of oldest wooden wheel (5,150 y)
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Estimated population of Plains Zebra (750,000 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.