## gravity

What goes up must come down — or does it? Find out how to cheat gravity with

**Julian Havil**.**Lewis Dartnell**explained how chaos on the brain is not only unavoidable but also beneficial. Now he tells us why the same is true for our solar system and sends us on a journey that has been travelled by comets and spacecraft.

*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.

**Anita Barnes**.

Solving the mathematics of drapery may help change the way we shop.

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