# Articles

Designing loudspeakersIn his second article,

**David Henwood**explains the role of mathematics in the design of Hi-Fi loudspeakers.
What a coincidence!Coincidences are familiar to us all but what are the so-called laws of chance? From coin tossing to freak weather events,

**Geoffrey Grimmett**explains how probability is at the heart of it all.
Mathematical mysteries: twin primes

We know there is infinitely many primes, but are there infinitely many twin primes?

Mathematics, marriage and finding somewhere to eatHow do you choose a partner? Is it an irrational choice or is it made rationally, based on a mathematical model which analyses the best potential partner you are likely to meet?

Coding theory: the first 50 yearsSpace probes, like NASA's recent Pathfinder mission to Mars, have radio transmitters of only a few watts, but have to transmit pictures and scientific data across hundreds of millions of miles without the information being completely swamped by noise. Read about how coding theory helps.

Mathematical mysteries: Kepler's conjecture

Sir Walter Raleigh is perhaps best known for laying down his cloak in the mud for Queen Elizabeth I. But, he also started a mathematical quest which to this day remains unsolved.

Editorial

- Allergic to mathematics?
- The inner beauty of pure mathematics
- A journey with mathematics
- Staff room

Mathematical mysteries: the Goldbach conjecture

Can every even number greater than 2 can be written as the sum of two primes? It's one of the trickiest questions in maths.

Call routing in telephone networksFind out how modern telephone networks use mathematics to make it possible for a person to dial a friend in another country just as easily as if they were in the same street, or to read web pages that are on a computer in another continent.

Understanding turbulenceHave you ever been in an aeroplane on a smooth flight when suddenly the plane bumps up and down for a short time as it goes through turbulent air? The study of turbulence is used to understand a range of phenomena from the simple squirting of a jet of water to the activity of the sun.

Daniel Bernoulli and the making of the fluid equationDaniel Bernoulli (1700-1782) discovered the relationship between the density of a fluid in a pipe, the speed it is travelling in the pipe and the pressure exerted by the fluid against the walls of the pipe. This is the story of what happened.