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

Chemists **John Watling** and **Allen Thomas** talk to *Plus* about the vital role of maths in presenting criminal evidence.

Infinite series occupy a central and important place in mathematics. **C. J. Sangwin** shows us how eighteenth-century mathematician Leonhard Euler solved one of the foremost infinite series problems of his day.

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

**John Henstridge** and **Jodie Thompson** tell *Plus* about life as consultant statisticians, modelling real-world problems in areas as diverse as the shipping industry and water rationing.