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Distance a kangaroo can jump (13.5 m) is 250 x Width of a credit card (54 mm)
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Time since Shakespeare's play Hamlet was written (422 y)
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.