"And then one day someone discovered how to make fire. Do you realise what that actually means? Can you do it? Not with matches, because they didn't exist. But by rubbing two sticks together until they become so hot that in the end they catch fire. Have a go and the you'll see how hard it is!"

- E.H. Gombrich, 1935, p. 7

Gombrich, E. H. (1935) A Little History of the World. London: Yale University Press.