Frances Elwell looks at the eddies and currents, from the pungent problem of sewage outflow to the search for bodies of people who have fallen into rivers, explaining that fluid mechanics lies behind it all.

Are records predictable in any way?

The three door problem has become a staple mathematical mindbender, but even if you know the answer, do you really understand it? Phil Wilson lets his imagination run riot in this intergalactic application of Bayes' Theorem.

Careers in mathematics: A set of three posters from Plus

Two people who get on well together can often find their relationship destabilised by the arrival of a third into their orbit.