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Length of Tower Bridge over the Thames (244 m) is 50 x Length overall of a `49er` racing dinghy (4.88 m)
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Height of the CN Tower in Toronto (553 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.