By Hamish Johnston

On Thursday mornings I drop my children off at school and walk to work listening to the BBC Radio 4 programme “In Our Time”, presented by Baron Bragg of Wigton — or Melvyn as he likes to be known.

Bragg is one of those rare intellectuals who seems completely at ease as a broadcaster and every week he somehow manages to get a panel of three academics into a lively discussion about just about anything from “St Hilda – the life and times of the Abbess of Whitby”, to “The Multiverse – the universe is not enough”.

This morning the subject was “The Physics of Time”, and the panel was Jim Al-Khalili, Professor of Theoretical Physics and Chair in the Public Engagement in Science at the University of Surrey; Monica Grady, Professor of Planetary and Space Sciences at the Open University; and Ian Stewart, Professor of Mathematics at the University of Warwick.

You can listen to the programme here and you can find an archive of all programmes here.