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Mass of IndyCar (excl driver or fuel) on speedways (712 kg) is 10 x Mass of largest gold nugget ever found (71 kg)
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Land used for agriculture in Niger (2011) (105.3 km^2)
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.