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**information theory**to explain how to cut down the number of tests significantly, by pooling samples of blood.

**maths student**Emily Dixon about her university studies, and where maths might take her in the future.

- Beaglemania - The Beagle is missing in action, but it is inspiring a new generation of would-be astronauts.
- Careers with Maths - Plus has been given a grant to produce posters based on our popular careers library.

*Plus*, Marcus du Sautoy continues his exploration of the greatest unsolved problem of mathematics: The

**Riemann Hypothesis**.

**Calculus**is a collection of tools, such as differentiation and integration, for solving problems in mathematics which involve "rates of change" and "areas". In the second of two articles aimed specially at students meeting calculus for the first time, Chris Sangwin tells us how to move on from first principles to differentiation as we know and love it!