One of my wisdom teeth is coming in, and my dentist is on holiday. It’s my own fault: he’d warned me to have them taken out, and I hadn’t listened. On Monday, while waiting until I could take the next ibuprofen, I emailed intelligentdesign.org: ‘How do you account for wisdom teeth?’ The blessings of suffering?

I looked for mentions of wisdom teeth in fiction. Up came the novels of Ian McEwan: a wisdom tooth extraction provides a suspected criminal with an alibi in Saturday, and in On Chesil Beach, when the boy kisses the girl, ‘he probed the fleshy floor of her mouth, then moved around inside the teeth of her lower jaw to the empty place where three years ago a wisdom tooth had crookedly grown until removed under general anaesthesia.’