In this Cyberchase video segment, the CyberSquad figures out how to earn 100 snelfus in 11 days.

In this video segment from The Supreme Court, learn about the 1883 Supreme Court decision that marked the end of federal protections for individuals in states and the beginning of Jim Crow segregation.

In this video segment from Nature, discover the various roles the cat has played in our history. [6:54]

Wild pandas are treated at the Wolong Conservation Center in this video segment from Nature.

The Baka are a semi-nomadic forest people who live in the republic of Cameroon in central Africa. In this video from Africa, the Baka men meet with a government official for help to protect their forest.

Loggers steal trees from the rainforest of Cameroon, one of Earth's oldest living ecosystems, in this video segment from Africa.

In this video segment from Nature, learn about the role of dogs in the lives of humans.

Perform a virtual heart transplant in nineteen easy steps with this interactive feature from the NOVA: "Electric Heart" Web site. This interactive feature provides an in depth and realistic look at this procedure.

In this ZOOMSci experiment, you're invited to walk through a grassy or weedy field in your stocking feet, then plant a sock and see what grows.

See how the human heart moves blood through the body in this animated feature from the NOVA: "Cut to the Heart" Web site.

This video segment from NOVA: "The Mystery of Animal Pathfinders" explores the migratorial exploits of monarch butterflies. [4:39]

This video segment from ZOOM compares and contrasts the habitat and life forms found in Death Valley with those found in the temperate rain forest of the Pacific Northwest. [3:46]

This video segment from NOVA: "The Mystery of Animal Pathfinders" explores honeybee communication and navigation. [4:45]

This diagram from the NOVA: "Kingdom of the Seahorse" Web site reveals some of the more remarkable traits of this enigmatic creature.

This video segment explains centripetal force and illustrates how roller coasters rely on it to give you a thrilling ride. Includes background reading material and discussion questions. [4:40]

Survey potential bridge sites, research bridge design, and select the right bridge for the right location in this interactive activity from the NOVA: "Super Bridge" Web site.

An example of the Red Queen hypothesis, the sexual population of Mexican Poeciliid fish is able to keep up with a changing environment, while the asexual populations are not as successful. From Evolution: "Why Sex?" Video length: 4 min....

Think you can tell a yam from a yak? Examine these still images of typical plant and animal cells from Biology by Kenneth R. Miller and Joseph Levine. What similarities and differences can you find?

This interactive activity from ZOOM offers a chance to experiment with a virtual pendulum and to see how it can be influenced by a variety of factors.

This interactive activity from McDougal Littell/TERC visualizes the effects of the Exxon Valdez oil spill, factors that influence oil spill behavior and impact, and techniques used to contain and clean up oil spills at sea.

The story behind Jocelyn Bell's role in the discovery of pulsars is told in this colorful, comic-book-style resource from A Science Odyssey Web site.

This interactive resource adapted from the National Park Service describes the many forces that affect shorelines, including tides, weathering, erosion, and deposition. Includes background reading handout and discussion questions.

This interactive resource adapted from the National Park Service describes the different kinds of sediments that make up coastlines, with a focus on the variety in color, size, and sorting.

This illustrated essay from A Science Odyssey Web site explains the science behind radio waves, including the role of electrons and electromagnetic fields.