Did you know? Length of North America (North to South) (8,600 km) is 400 x Length of Manhattan Island (21.6 km)
Height of Sydney Opera House (65 m)
/fact/height-of-sydney-opera-house
Link
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.