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Time since the birth of Omar Khayyam (971 y) is 4 x Time since birth of Sophie Germain (243 y)
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Forest in Mongolia (2011) (110,000 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.