Along with nuclear proliferation and the deteriorating condition of the natural environment, human population growth has become an issue of significant public concern during the past century. With the global population increasing at an ever-accelerating rate, how can the world continue to support its freight of humanity?

The common bumblebee is a familiar visitor to European gardens. At first sight there's nothing particularly remarkable about this small furry interloper, but it has been a source of mathematical controversy for nearly a century.

Paul Clifford Paul Clifford is the Deputy Head of Maths at Elizabeth Garrett Anderson school in Islington. The Plus team visited him there to hear about life as a secondary maths teacher.
Underlying our vast global telecommunications networks are codes: formal schemes for representing information in machine-readable and transmissible formats. Kona Macphee examines the prefix property, one of the important features of a good code.
Helen Thompson works for Sainsbury's Supermarkets as a Sales Forecasting Manager. The Plus team paid her a visit at Drury House on the banks of the Thames in London.
At the Hewlett Packard campus in Bristol, a group of keen researchers are bringing together the worlds of advanced mathematics and fine art. Kona Macphee investigates.
Francesco Mezzadri from Italy and Nina Snaith from Canada are PhD students in Applied Mathematics at the University of Bristol. They are also affiliated with Hewlett Packard's BRIMS Laboratory. PASS Maths went to visit them there.
Starting in this issue, PASS Maths is pleased to present a series of articles about proof and logical reasoning. In this article we give a brief introduction to deductive reasoning and take a look at one of the earliest known examples of mathematical proof.