Cédric Villani. Image: Renate Schmid.

At this year's British Mathematical Colloquium we talked to the French mathematician and Fields medallist Cédric Villani. He told us about dynamical systems: from the possibility that our solar system will one day become unstable and the planets collide, to chaos in gases, the unpredictability of the stock market and unruly children. He also told us what it's like being a mathematical superstar and why mathematicians should talk about their work more.

You can also listen to a previous interview with Villani, recorded when he had just received his Fields medal, and read about the work that won him the prize.