Energy Flow

This feature, adapted from Interactive NOVA: "Earth," follows the path of energy as it is transferred via the food chain from one type of organism to another.

Energy Flow in the Coral Reef Ecosystem

This video segment, adapted from NOVA, describes the energy flow in a coral reef, including its food web.

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Energy in a Roller Coaster Ride

See potential energy convert to kinetic energy in this interactive activity from WGBH that shows a roller coaster in action.

Energy Transfer in a Trebuchet

On NOVA, a team of carpenters, timber framers, engineers, and historians recreate a medieval throwing machine called a trebuchet. This adapted video segment explores how understanding energy transfer informs their design.

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Engineering for the Red Planet

In this video segment from NASA, robotics researcher Ayanna Howard uses engineering to improve the intelligence of robots in space exploration.

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Erosion and Weathering

Erosion and weathering may be caused by a variety of factors including wind and water. This still collage produced for Teachers' Domain features images of rock, soil, and beach erosion.

Europa Jupiter System Mission

This video from NASA introduces a proposed mission to study potential habitable worlds around gas giants such as Jupiter.

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The Evolution of the Kuiper Belt

This video from NASA explores how the structure of the Kuiper belt can provide insight into the formation of the solar system and indicate the presence of planets.

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Evolution of the Moon

This video from NASA looks at how Earth's moon has changed since its formation about 4.5 billion years ago.

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Expedition 8 Crew Talks to Students in Japan

In this video segment adapted from NASA, students in Matsuyama City, Japan, interview Expedition 8 Commander and NASA Science Officer Mike Foale and Flight Engineer Alexander Kaleri about life and work aboard the International Space Station.

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Exploration of Comets

In this interactive activity from NASA, explore the anatomy and life cycle of a typical comet and learn about several comet missions.

Exploring Tidepools

In this interactive activity adapted from the National Park Service, learn about tidepools and then try to identify the organisms that live there.

First Spacecraft at Uranus

Learn about some of the discoveries made by the Voyager 2 spacecraft during its 1986 trip to Uranus in this video from NASA Jet Propulsion Laboratory.

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Flood Plain and Higher Ground Habitats

This video segment from NatureScene features the area of the Congaree Swamp where the high ground and the flood plain meet. Learn how a few feet of difference in elevation on a floodplain can yield drastic changes in what you’ll find living there.

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Frequency

In this interactive activity adapted from the University of Utah's ASPIRE Lab, investigate frequency in terms of trampoline jumps, pendulum swings, and electromagnetic waves.

From Seed to Fruit

Children get a glimpse of what happens underground in the life of a cherry tomato plant in this original animated video from KET.

From Seed to Fruit Interactive

Children get a glimpse of what happens underground in the life of a cherry tomato plant in this original animated video from KET.

Galileo on the Moon

Watch Apollo 15 astronaut David Scott perform Galileo's falling objects experiment on the Moon in this video segment from NASA.

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Galileo on the Moon

Watch Apollo 15 astronaut David Scott perform Galileo's falling objects experiment on the Moon in this video segment from NASA.

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Gallery of Cells

While all cells have a great deal in common, there is no end to the variation among them. These images provide a sense of the wondrous diversity found in the world of cells.