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Time since the first passenger steam railway service (195 y) is 4 x Time since the launch of Intel's first microprocessor, the 4004 (49 y)
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Estimated population of Sumatran Rhino (100 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.