Did you know? Time since the first iron steamship crossed the English Channel (202 y) is 2.5 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (80 y)
Diameter of a CD / DVD (120 mm)
/fact/diameter-of-a-cd-dvd
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.