## Articles

**Andy Burbanks**explains what Lyapunov Exponents are, what the much misunderstood phenomenon of chaos

*really*is, and how you can iterate functions to produce marvellous images of chaos from simple mathematics.

**Jon Walthoe**explains why Benford's Law says otherwise, and why tax inspectors are taking an interest.

**Kona Macphee**investigates.

**Helen Mason**explains.

**Robert Leese**explains how the mathematics of colouring graphs can help avoid interference on your mobile phone.

**J.V. Field**continues our series on the origins of proof with an examination of Kepler's astronomy.