This video segment adapted from NOVA/FRONTLINE looks at the future of global warming as developing nations, including India and China, increase their need for energy.

Is the hydrogen car the answer to global warming? This video segment adapted from NOVA/FRONTLINE looks at the pros and cons of this developing technology.

Explore the world of lines. Investigate the relationships between linear equations, slope, and graphs of lines. Challenge yourself in the line game!

In this video segment adapted from NOVA, watch residents of the Peruvian Andes build a suspension bridge made entirely of grass. The ancient Inca were a textile society and thus skilled in working with natural fibers including alpaca and cotton. Still, it might surprise people today that their solution to crossing the canyons and gorges of their mountainous empire featured another fibrous material: grass. When you consider how they built a simple suspension bridge, you'll realize that not only was this a practical solution, it was also a safe one. In this video segment adapted from NOVA, watch residents of the Peruvian Andes as they build a traditional and functioning grass bridge the likes of which enabled the ancient Inca people to flourish for several hundred years. Grades 3-12.

How do greenhouse gases affect the climate? Explore the atmosphere during the ice age and today. What happens when you add clouds? Change the greenhouse gas concentration and see how the temperature changes. Then compare to the effect of glass panes. Zoom in and see how light interacts with molecules. Do all atmospheric gases contribute to the greenhouse effect?

This article highlights science lessons and activities that can help elementary students gain an understanding of the tools and technology involved in polar research. Suggestions for literacy integration are provided, and activities are aligned to national standards.

This article highlights hands-on or multimedia lesson plans about oceans. Science lessons are paired with suggested literacy lesson plans. All lessons are aligned to national standards.

This article is about the latest remake of Jules Verne's popular 144-year-old novel Journey to the Center of the Earth that also provides links to the American Geologic Institute's (AIG) Educator Guide for using the movie (Journey to the Center of the Earth 3D) to interest students in geology and earth science.

In this video segment from PEEP and the Big Wide World, children experiment with cardboard and build a house for their stuffed animals.

From this original story, young readers and listeners learn about four tools scientists use to study climate - climate stations, weather balloons, satellites, and buoys. The story is available at two reading levels and in three formats - text-only, illustrated booklet, and electronic book. Glossary included. Each issue of Beyond Weather and the Water Cycle contains an original story that expands on the theme.

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.

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 fast-paced NASA Brain BitesŒ_íěÖ video, an astronaut demonstrates the impact of microgravity on the use of tools in space.

This video segment adapted from the Space Telescope Science Institute shows what the Hubble telescope found when it stared at a single, nearly empty spot in the sky for 10 days in 1995. The unexpected result was a picture of a multitude of galaxies stretching into the distance.

This video segment from NOVA: "Cracking the Code of Life" looks at the meaning and significance of the effort to decode the human genome.

This showcase of digital broadsides is devoted to nature poets and their work. Imagine Nature explores the convergence of poetry, graphic arts, and the technology of the Internet. Along with the text of the poem, some broadsides includes an audio reading (often by the author), photographs or original artwork, related nature sounds, or videos. The featured works include: "The Snakes of September" by Stanley Kunitz| "Sleeping In the Forest" by Mary Oliver| "St. Francis and the Sow" by Galway Kinnell| "For Luis" by Michael McClure| "The Butterfly Obtains" by Emily Dickinson| "Little Cosmic Dust Poem" by John Haines|"Sitting by a Swamp" by David Wagoner.

This video segment adapted from A Science Odyssey looks at the invention of the automobile and the development of mass production.

This video segment adapted from A Science Odyssey looks at the invention of nylon.

This video segment adapted from A Science Odyssey considers modern technology's impact on society.

In this video segment adapted from NASA, astronomer Michelle Thaller introduces the world of infrared light and demonstrates how infrared cameras allow us to see more than what the naked eye can perceive.