## Articles

**Paulus Gerdes**takes us on a tour of the mathematical properties of some beautiful designs inspired by the traditional art of Angolan tribespeople.

*Plus*talks to

**Sir Roger Penrose**about all this and more.

**C. J. Sangwin**shows us how eighteenth-century mathematician Leonhard Euler solved one of the foremost infinite series problems of his day.

**Brian Butterworth**tells us about research showing that even newborn babies have a basic understanding of number. It seems we are all mathematicians!

**Professor Kip Thorne**shows us how to eavesdrop on these cosmic events by watching for telltale gravitational waves.

**Colin Adams**asks when is a molecule knot a molecule? and what happens if you try to build a knot out of sticks?

**Rachel Thomas**looks at Shannon's life and works.

Cookies are set out on a rectangular grid. The bottom left cookie is poisoned.

Two players take it in turn to "chomp" - that is, to eat one of the remaining cookies, plus all the cookies above and to the right of that cookie.