A demonstration of how a source of light is required to see objects in the dark. The presenter shines a torch around a dark room and sees shiny and white objects. The presenter also shows Boffin the cat's eyes shining in the dark. She then turns the torch off and we cannot see anything - a source of light is required to see in the dark. The presenter goes on to explain that Boffin's eyes do not actually glow in the dark and that they are simply reflecting the light from the torch.
This clip could be used to explore light and shadow or how we see things. This could be used at the beginning of the topic and a challenge could be set for the children following the clip to investigate the brightness of a variety of light sources using data loggers. They could also investigate how effective a torch is as a light source by looking at how the light travels through different materials. Pose the question - "how many layers of material are needed to block the light?"