When your sprouting scientists are learning about light, have them watch this video to consider what happens to an object's shadow when there is more than one light source. The teacher involves several teens at an educational convention by asking them to contribute their shadows in the multi-lighted exposition hall. Next, he uses a projector to show the crisp, clear image produced by a shadow in a single source of light. The content is somewhat limited, but it might make an interesting addition to your in-class lesson.