## 46

*Plus*spoke to

**Peter Wadhams**from the Polar Ocean Physics Group at the University of Cambridge to get a glimpse of the group's work.

*On the origin of species*, but also 200 years since the birth of its author, Charles Darwin. At the heart of Darwin's theory of evolution lies a beautifully simple mathematical object: the evolutionary tree. In this article we look at how maths is used to reconstruct and understand it.

**Charlotte Mulcare**uses milk to show how maths and stats can provide genetic answers.

**Lewis Dartnell**turns the universe into a matrix to model traffic, forest fires and sprawling cities.