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Time since the start of the Iron Age (3,200 y) is 40 x Lifespan of human being (80 y)
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Mass of a Boeing 747-400 airliner (max takeoff weight) (397,000 kg)
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.