Cookit- Picture Teller
This site is designed to demonstrate how recipes are made, but can easily be adapted to showing science diagrams etc! Consider putting together a short show labeling the different parts of a cell.
This tool allows you to use your own pictures and audio to demonstrate how a recipe is made. A simple zoom tool allows you to focus in on the items in a picture you are talking about, as you outline the ingredients and stages that are important in creating your recipe.
At present, the articles that you make with this tool can only be downloaded and used locally on your own PC or laptop.