## gravity

*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.

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

**Anita Barnes**.

*Plus*is a special, marking the occasion of Stephen Hawking's 60th birthday. Plus attended his Birthday Conference in Cambridge, where we interviewed some of the world's most influential mathematicians and physicists.

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

*Plus*is very proud to present

**Professor Stephen Hawking**'s own Birthday Symposium address.

**J.V. Field**continues our series on the origins of proof with an examination of Kepler's astronomy.

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