I am writing this on a computer that I can’t imagine living without. This is an alarming thought, the extent to which I have organised my life around a metal box full of wires (and, via the Internet, to many other metal boxes full of wires). Someone told me most of the Internet is stored in a warehouse somewhere in North Carolina. I don’t know enough about technology to gauge if this is true, but it made me realise how little I actually understand about the world I inhabit. The world of Dr Wong’s childhood was significantly smaller than mine, but he understood every square inch of it.