# Articles

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.

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.

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.