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Time since start of building of the Colosseum (1,947 y) is 10 x Time since the first passenger steam railway service (196 y)
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Circumference of Venus (37,700 km)
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.