Did you know? Mass of an adult male Polar Bear (800 kg) is 25 x Mass of R2-D2 droid in the Star Wars movies (32 kg)
Age of earliest stone hand axe (2.6 million y)
/fact/age-of-earliest-stone-hand-axe
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.