What do you get if you have a studio, then add one mathematician, then add another mathematician... yes, that equals a special maths podcast.

Richard Elwes is a writer, teacher and researcher of mathematics and visiting fellow at the University of Leeds. He knows a thing or two about model theory. In case you were wondering, his Erd?s number is 3!

Richard's new book is How to Build a Brain.

Our other 'numbers expert' is Ian Stewart. He's Emeritus professor of mathematics at the University of Warwick as well as a fellow of the Royal Society.

He's written too many books to mention, but his latest is called the Mathematics of Life.

Amongst the fawning and picture-taking, we managed to grab Brian Cox for a few minutes when he dropped in on the Guardian's science desk. He was doing a live Q&A webchat.

Brian discusses an encounter with a supermodel as well as his next TV series. His current series, Wonders of the Universe is on BBC2 right now.

The Guardian's Nell Boase is also with us as we take a quick look at some recent news stories; why cuckoos appear to be in an arms race, a machine that could replace scientists, and spider encrusted trees.

This is a no-calculators-allowed edition of Science Weekly!

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