Electron microscopy and atomic force microscopy are two basic techniques in materials science. St Paul’s School will bring these microscopes to enable you all to have a go! They will also bring demonstrations of: structural colour in fossilised ammonite shells, butterflies, and beetles; and will have a range of microfossils. The public can pick out a microfossil using a light microscope, which magnifies up to about 100x, then put it in the electron microscope and magnify to 30000x! Look at ammonite shell under the light microscope, and wonder where do those iridescent colours come from?! Ask one of St Paul’s students, and they can help you zoom in with the electron microscope to see the reason.