## Articles

**grand mathematical challenges**of the 21st century. But be warned...these problems are hard. In the first of two articles, Chris Budd explains how to hit the bigtime.

*Plus*finds out about the role of mathematical

**symmetry in chemistry**.

- Information overload - how mathematicians are helping us all to make sense of the vast amount of information now available to us
- Sum problems - can you be good at mathematics without being good at arithmetic?
- Readers' corner - Meet Mandy, the cuddly Mandelbrot set!

**mathematics of perspective**, researchers are now able to produce three-dimensional reconstructions of the scenes depicted in these works.

**data compression**.

*Plus*find out how this is changing, thanks to

**Dasher**, a new open-source text-entry system based on

**arithmetic coding**.

**Isaac Newton**and David Gregory - took place on the campus of Cambridge University. The discussion concerned the

**kissing problem**, but it was to be another 260 years before the problem was finally solved.