Summer school slides

I talked via a video link to teachers at this summer school at Geelong in Australia this morning (or yesterday evening, depending on where the centre of your universe is), which was very exciting. For those of you there yesterday evening, thank you so much for the excellent question/ discussion session at the end, I learned much from it. Thanks also for the Mexican wave before the talk - it meant I connected immediately to you from all those miles away despite you being contained in a tiny square at the top of my screen! Enjoy the rest of the summer school.