"The Spirit Level", an influential book which uses statistics to argue that income inequality within rich countries is correlated with many serious social problems, has provoked a fierce argument over the evidence. We look - as always - at the numbers.
Should we be surprised that after his release a year ago, with three months to live, the Lockerbie bomber is still alive? Perhaps not: the mean average life expectancy for people given three months to live is longer than three months.
Tim and Dr Walker test the theory that cycling helmetless is safer.
Hard (hat) facts
The Mayor of London has described a new city-wide cycle-hire scheme as "helmetless", prompting More or Less to ask: what does the evidence tell us about the usefulness of cycle helmets?
Lindenstrauss, Ngo, Smirnov and Villani - ICM Field's Medal winners.
The International Congress of Mathematicians is the most exciting - yes, exciting! - event in maths. We sent Alex Bellos, author of "Alex's Adventures in Numberland", to see if he could understand what's going on at the furthest frontier of maths. (Hint: he couldn't.)
Read more from Alex Bellos' blog
BBC Radio 4's More or Less is broadcast on Friday, 27 August at 1330 BST and repeated on Sunday, 29 August at 2000 BST.
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