## differential equation

*Plus*found out how maths can explain all this and more.

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

**André Léger**studies the fluid mechanics of food travelling through the intestines for consumer goods giant Unilever.

**Lewis Dartnell**solves these, and other, puzzles of animal patterning.

*Plus*, we heard how a simple mathematical equation became the subject of a debate in the UK parliament.

**Chris Budd**and

**Chris Sangwin**continue the story of the mighty quadratic equation.

**mathematical modelling**.

**Herbert Huppert**tells us what happens when two fluids of different densities meet, for example when volcanos erupt and hot ash-laden air is poured out into the atmosphere.

**Matthew Keeling**describes some of the mathematical developments that have improved our understanding and predictive ability.