## Articles

**Yutaka Nishiyama**illuminates the connection between light bulbs, logic and binary arithmetic.

**Paul Davies**has made an unusual move into the infant discipline of astrobiology. He tells

*Plus*about his interest in the big questions: what is life, how would we recognise aliens - and are they all around us?

**Jeffrey Rosenthal**follows Galileo's observation that the entire universe is written in the language of mathematics - and that includes music.

**Tope Omitola**looks back at the tragically short but inspiringly productive life of a true original: Evariste Galois.

**Lewis Dartnell**, it could be that the mathematical phenomenon of chaos is a crucial part of what makes our brains work.

**Claire Ellis**tells us about their heroic efforts, which historians believe shortened the war by two years.

**Lewis Dartnell**explains, our brains have evolved to take pleasure in rhythm, structure and pattern. Since these topics are fundamentally mathematical, it should be no surprise that mathematical methods can illuminate our aesthetic sense.