Did you know? Time since the end of the Carboniferous geologic period (299 million y) is 20 thousand x Time since first humans in Americas (15,000 y)
Diameter of a UK 1p coin (20.3 mm)
/fact/diameter-of-a-uk-1p-coin
Link
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.