"As a theoretical physicist I spend a lot of my time thinking about fundamental particles smaller than an atom. But I also spend some of my time thinking about the Universe, which is about as big as you can get. ... I'd like to take you on a journey to the very small and the very large."

This talk by Professor Ben Allanach (Department of Applied Mathematics and Theoretical Physics, University of Cambridge) was originally given to an audience of Year 12 A-level Maths students (aged 16-17). The talk formed part of a mathematics enrichment day we organised with a special focus on encouraging creative mathematical thinking. It was recorded on 19 June 2015.

You can read an article based on this talk on Plus, our free online mathematics magazine. Watch more talks here.