Did you know? GDP in Sierra Leone (2020) (4.13 billion USD p/a) is 2.5 x GDP in San Marino (2017) (1.643 billion USD p/a)
A parsec (31 trillion km)
/fact/a-parsec
Link
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.