Did you know?
Mass of a regulation tennis ball (57 g) is 10 x Mass of a USA quarter (25c piece) (5.67 g)
Tweet this comparison
Top speed of a killer whale (48.3 km/h)
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.