## Articles

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.

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

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.

Compound interest is the curse of debt and the blessing of saving. Find out how it works and what it has to do with one of the most important numbers in mathematics.

We talk to pioneering mathematician Stephen Cook, who came up with the concept of NP-complete problems, about his work, computer science, and artificial intelligence.