The document discusses emerging technologies in education including augmented reality (AR) which superimposes digital elements onto a user's view of the environment by overlaying computer-generated content in real time to create a simulated reality. It also discusses 3D printing which creates objects by adding material layer by layer, with 3D printers converting designs into 2D slices that are combined to form 3D objects. The document is authored by Rupert Forsythe and explores how AR works using device cameras and apps to trigger virtual environments, as well as how 3D printing works by building up objects slice by slice.