Michael Rosen talks to James Geary about his lifetime obsession, aphorisms. These short, witty philosophical sayings have been coined by everyone from Emily Dickinson and James Baldwin to Hallmark, and even Michael's mum.

Produced for BBC Audio Bristol by Sally Heaven, in partnership with the Open University. Subscribe to the Word of Mouth podcast and never miss an episode: https://www.bbc.co.uk/sounds/brand/b006qtnz