The Large Hadron Collider (LHC) is the largest and most complex experiment ever built. It is located at the CERN laboratory near Geneva, Switzerland. What is it, and what does it do? Theoretical physicist Peter Skands will take us on a tour of the experiments performed there, and the laws of nature that they are built to push to the limit. This Sydney Ideas event was held on Tuesday 25 September, 2018 at the University of Sydney. https://sydney.edu.au/news-opinion/sydney-ideas/2018/why-the-large-hadron-collider-is-a-game-changer.html