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Length of the longest canal tunnel (Rove Tunnel in France) (7.12 km) is 2.5 thousand x Length overall of a `RS:X` windsurfing board (2.86 m)
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Width of a football goal (7.32 m)
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.