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Length of the Congo River (4,700 km) is 25 x Length of the M25 Orbital motorway around London (188 km)
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High estimate of world population of Tigers (3,900 individuals)
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.