Alex Bellos has made another documentary for BBC Radio 4, this time about the number zero. It’s a pleasant bit of numerical tourism, as Alex travels to India to find the source of the number zero in a small shrine, with a diversion to talk about Vedic maths along the way.

You can listen to *Ni**rvana by Numbers* on the BBC iPlayer. It looks like it’s available indefinitely. If Alex has whetted your appetite for historical zeroes, the book *Zero: The Biography of a Dangerous* Idea by Charles Seife is a cracking read.

**Listen: ***Nirvana by Numbers* on BBC Radio 4.