Did you know?
Height of the Great Sphinx of Giza (20.21 m) is 4 x Women's Olympic Pole Vault record (2008) (5.05 m)
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Height of a typical Hot Air Balloon (24 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.