## Articles

Are the unchanging features of the Universe really unchanging?

**Jerry Gollub**tells

*Plus*about a new discovery which combines experiment with sophisticated maths.

**Carola Schönlieb**explores how mathematicians use the heat equation to fill in the gaps.

**Phil Dench**tells

*Plus*how he uses mathematics to help bring these models to life.

**Oli Freke**has always been fascinated by sine waves, so much so that he's created a song based on them for the Geekpop festival, which is currently taking place on the Web. In this article he explores his song, touching on ancient Greek mythology, strange piano tunings and Johann Sebastian Bach.

**David Spiegelhalter** and **Mike Pearson** explore how risk can be spun and there's an interactive animation for you to have a go yourself.