A few months ago, my teenage daughter and I went to see a lecture by Stephen Hawking at Oxford’s Mathematical Institute. The event had been postponed once because he was unwell; I worried that his body might finally give out, albeit five decades later than doctors had expected. Yet a new date was set and Hawking duly arrived, as if from another world, to deliver a spellbinding talk in his distinctive synthetic voice.

I had given a lecture myself at the same venue earlier, striking a pessimistic tone: it was easy to pollute the stream of conversation about science and statistics, I said, and simply intoning the facts would not dispel misinformation. Hawking, who died this week, went some way to restoring my hope. He showed that it was possible to communicate difficult ideas, if you went about it in the right way.

What was his secret? He acknowledged that his disability attracted the spotlight, but there was much more going on than the spectacle of a brilliant mind in a malfunctioning body.