*"This talk will mostly be stories... I want to tell you about Albert Einstein, and about his theory of relativity - what it is, why he was thinking about it and also about some of the very latest developments that have happened just this year."*

This talk by Professor David Tong (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 the development of mathematical thinking. It was recorded on 27 June 2014.