Did you know? Height of the Hoover dam wall (221.4 m) is 2 x Height of St Paul's Cathedral in London (111 m)
Capacity of petrol/gasoline road tanker (30,000 L)
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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.