## mathematical modelling

The 2004 Abel Prize celebrates one of the great landmarks of 20th century mathematics.

A mathematical approach might simplify studying how our genes operate.

*Plus*takes an illustrated tour of an extraordinary geometric construction: the

**Klein bottle**.

Mathematics shows that open source software beats closed source software in the race to fix bugs.

**Navier-Stokes equations**.

**mathematical modelling**.

*Plus*talks to the Government Actuary, Chris Daykin about the

**pensions crisis**, and how actuaries use statistical and modelling techniques to plan for all our futures.

*Plus*finds out about her career path.

**Ian Garbett**discusses radioactive decay.