Dr. Kerry Hanson of UCR Chemistry speaks with David Pogue on NOVA's Beyond the Elements, which is available online now via your local PBS station. Using volleyball as an analogy, Kerry and David talk about the different types of UV radiation (UVA, UVB, UVC), their unique effects on life on our planet., and how high energy UVC rays are blocked by Earth's sunscreen, the ozone layer. A special thanks go to the Martin Luther King Boys and Girls Volleyball teams who pitched in to help illustrate the life-altering importance of the ozone layer!