## Articles

Since he Universe is all there is, there's nothing for it to expand into. So what does "expansion" mean?

How do you make a stealth aircraft that's invisible to radar? An area of maths called random matrix theory holds the answer.

Rock and its use for tools and buildings has shaped human civilisation. Here's an introduction to the maths of rocks.

From communication technology to LCD displays: crystals are a hugely important part of modern life. Find out more about them with this article.

Why your muesli shakes down in unexpected ways.

Fully functioning invisibility cloaks are closer to becoming a reality than you might think. Here's a quick look at the maths and science involved in producing them.

Is the proposed ABBA rule for penalty shootouts really fairer than the existing rule? Maths shows that it is, and also suggests another, more subtle rule.

The great thing about geometry is that you can sometimes prove things using pictures. Enjoy these three great visual proofs of Pythagoras' theorem!