Harry keeps track of the number of times he sneezes in certain locations to try to diagnose the cause of his allergy in this video segment from Cyberchase.
Harry and his students look at various arrangements of classroom desks in this video from Cyberchase.
This video segment from Nature explains the geologic forces behind the creation of Hawaiië_í__ dramatic shoreline.
In this video segment adapted from United Tribes Technical College, meet Native Americans who are concerned about climate change and believe that action today can help future generations once again live in harmony with Earth.
Learn why heart disease, a largely preventable condition, is the leading cause of death in this country today, in this video adapted from The Hidden Epidemic: Heart Disease in America.
In this video adapted from the National Science Center, observe a demonstration to discover how helium gas is inert and hydrogen gas is reactive.
This video segment adapted from Interactive NOVA profiles two scientists who were surprised in 1984 to discover a hole in our atmosphere's ozone layer as big as the United States.
Learn how a cow eats and digests food in this video segment from Nature.
This video segment, adapted from NOVA, explores reasons why Homo sapiens had an advantage over Neanderthals in the pursuit of territory and natural resources.
In this video from Outdoor Nevada, learn about the habitat, diet, and defense mechanisms of horned lizards.
In this video segment from PEEP and the Big Wide World, children experiment with cardboard and build a house for their stuffed animals.
In this media-rich essay from the NOVA Web site, astronomer Brent Tully of the University of Hawaii walks you through the latest scientific theories about the size of the universe.
This narrated animation from Interactive NOVA: "The Secret of Life" illustrates DNA replication.
This video segment adapted from NOVA describes the emergence of life on the islands of Hawaii from a barren volcanic platform under the ocean waves to the rich explosion of life that covers the many climate zones of the islands today.
In this video segment adapted from NOVA, dramatic footage of avalanches and animations of ice crystals illustrate how a layer of weakly-bonded snow can contribute to a devastating avalanche.
In this video segment adapted from NOVA, scientists use computer simulations to explore the question of how supercell thunderstorms produce tornadoes.
This video segment adapted from FETCH! shows contestants experimenting with different materials to see which is the best insulator and thus best able to keep the lemonade at their stand cool for customers.
Aaron and Justin investigate which sunscreen best keeps out harmful ultraviolet rays from the Sun, in this video from DragonflyTV.
This illustrated essay from A Science Odyssey Web site explains the science behind radio waves, including the role of electrons and electromagnetic fields.
In this video segment adapted from Shedding Light on Science, observe demonstrations of the fundamental idea that light travels in straight lines.