More or Less: Behind the Stats - How to explain infinity to a 4-year-old

?What?s the number before infinity?? asks Claudia, aged 4. We challenge Johnny Ball, legendary British TV presenter, to explain. And in celebration of the voice of Sesame Street?s Count von Count, Jerry Nelson, who?s died aged 78, there?s another chance to hear our 2009 interview with the Count, in which he revealed his favourite number: 34,969. Presented by Ruth Alexander, this programme was first broadcast on the BBC World Service.

More or Less: Behind the Stats - Levelling the statistical playing field

Given that some countries are richer than others, and some have larger populations, what should the Olympic medal tally really have looked like? Also: numbers help us understand the world. But for Daniel Tammet, author of ?Thinking in Numbers". They don't just help him to understand the world - but to be a part of it.