The Fields medallist reveals the beauty of numbers, how he drew inspiration from Sanskrit maths and a Rubik's cube, and how his maths fits with his tabla playing.
Martin Grötschel, Secretary of the International Mathematical Union, about maths at school, integrating developing nations, and his dream of putting all maths that's ever been produced online.
From the excitement of the announcement of the Fields medallists to meeting mathematicians from around the world (and eating great food), we've had a brilliant time at this year's ICM!