Digital imaging systems are very useful when you want to display something on a screen for a large audience. Document cameras are starting to replace overhead projectors in schools, as they can show any item on a projector or TV without the need to make that item into a transparency. Digital microscopes, like the one pictured, are capable of displaying microscopic images onto screens for all to see, so that every student doesn’t need to have their own microscope or take turns looking into one device. These fourth grade students have invited an expert in to talk to them about photosynthesis.