Did you know? Mass of Empire State Building (331 million kg) is 25 x Mass of Brooklyn Bridge (13.32 million kg)
Estimated world population of Harp Seal (4.5 million individuals)
/fact/estimated-world-population-of-harp-seal
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.