11:00 - 11:30
Martin Bell asks if our armed forces are relying too much on the Territorial Army.
For the first time, listen online to every episode ever broadcast, from Aristotle to the History of Zero.
You may need to download RealPlayer to listen to some archive programmes.
Melvyn Bragg and guests discuss the Arab historian Ibn Khaldun.
Melvyn Bragg and guests explore unintended consequences in mathematics.
Next on 11 Feb 2010 09:00 on BBC Radio 4
Melvyn Bragg's personal insight into the latest programme.
The In Our Time Companion, edited by Melvyn Bragg, features a personal selection of episodes from the series.