## Articles

Here's the ancient proof that there are infinitely many prime numbers.

Has the future already already been written? Is time just an illusion? Take a step outside of spacetime with cosmologist Marina Cortês to discover the *block universe*.

Is time real? Are we just puppets living out a future already written? Marina Cortês explains why she thinks time is fundamental and that we don't live in a block universe.

Marina Cortês is one of a growing number of physicists who believe time is fundamental. We ask her about the alternatives theories to the block universe, where time comes first.

Fundamental physics says time is symmetric - so why does time move forwards for us in a block universe?

The possibility that there might be many parallel worlds has just become a little more likely.

Mathematical models predict how fast a rumour will spread and how many people it's likely to reach.

A model of the interaction between predators and prey explains why sometimes frogs appear to eat snakes.