## Articles

**Burkard Polster**and

**Marty Ross**explain why, and explore the maths behind bell ringing.

**Nicholas Mee**discovers, that would be far too simple. In fact, the length of a day varies throughout the year. If you plot the position of the Sun in the sky at the same time every day, you get a strange figure of eight which has provided one artist with a source for inspiration.

**Burkard Polster**explains how to get to grips with the bewildering range of juggling possibilities and invites you to do your own virtual juggling.

**Josefina Alvarez**and

**Cesar L. Garcia**investigate.

**Ben Evans**explains how maths is used to build this car.

**Tim Johnson**was drawn into financial maths, not through an interest in finance, but because he was interested in making good decisions in the face of uncertainty. Tim explores the development of this interface between abstract mathematics and our everyday lives, and explains why a painting may only be worth its wall space.

**Gábor Domokos**, one of their discoverers, reckons that in some sense they barely exists at all. So what are Gömböcs and what makes them special?