## Packages

Many things in nature seem to be striving for a purpose — the carefully choreographed flocking of birds is an example. Are these birds really smart enough to follow a common goal? Find out with these articles.

If you feel like snuggling up on the sofa with your headphones in, then try our advent calendar filled with some of our favourite *Plus* podcasts!

The International Congress of Mathematicians (ICM) took place in Rio de Janeiro at the beginning of August. Here is all our coverage at a glance.

We explore non-constructive proofs and what happens if you try and avoid them.

Physics is all about observation, but how much can we actually see?

Find out all you need to know about the cosmic microwave background in this comprehensive overview.

From bendy rocks to invisibility cloaks — discover the fascinating maths of materials.