Interact with this world map from McDougal Littell/TERC to highlight different climate zones and see a photograph of each one. Ten climate zones are represented, including tundra, desert, humid subtropical, and others.

A profile of the life and leadership of Fannie Lou Hamer, a civil rights activist best known for her stirring testimony at the 1964 Democratic National Convention.

In this interactive activity from NOVA Online, learn about a type of exploding star a Type II supernova that is so large it has a mass 10 times greater than the mass of our Sun.

Travel deep into the human body to see exactly where your DNA resides. From the NOVA: Cracking the Code of Life Web site.

Examine these graphs from the NOVA/ FRONTLINE Web site to see dramatic increases in the temperature of Earth's surface and greenhouse gases in the atmosphere.

This essay from NOVA: "Life's Greatest Miracle" explores the debate over the use of embryonic stem cells in scientific research.

This illustrated feature from the American Experience Web site highlights the frequently forgotten inventors of several useful, innovative technologies.

Which dictates our existence? Is it our genetic makeup or the environment we grow up in? Kevin Davies offers an update on this long-standing debate, from the NOVA: "Cracking the Code of Life" Web site.

Why do hot air balloons float? This resource from the NOVA Web site offers a series of interactive activities that illustrates the physics of hot air balloons.

Follow the growth of a carcinoma from initial mutation to widespread metastasis in this feature from the NOVA: "Cancer Warrior" Web site.

Play in our streams and see how exhibitionism has an evolutionary payoff in this simulation of John Endler's famous experiment. Includes background information and discussion questions.

This video segment adapted from Shedding Light on Science illustrates how light changes speed, and thus direction, in a process known as refraction. Includes background reading and discussion questions. [2:05]

This visualization adapted from NASA features two satellite images from 1984 and 2000 that show the dramatic deforestation of the Bolivian rainforest. Includes background reading material and discussion questions.

In this interactive activity from ChemThink, students will take a closer look at atomic structure, properties, and behaviors. Includes background reading material and discussion questions.

This video segment explores the sense of taste in humans -- why we have it, and what happens when we lose it. Footage from NOVA: "Mystery of the Senses: Taste." Includes background reading material and discussion questions. [4:18]

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]

This lesson is provided to introduce students to the geography and people of the Sahel region and to have them discover the challenges and conflicts faced by the inhabitants. They learn about desertification and what farmers are doing to...

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.

In this interactive activity featuring videos adapted from the Rutgers PAER Group, students will observe examples of circular motion. Students will then find a common reason why the objects and people presented move in a circle. Includes...

In this interactive activity adapted from Wake Forest University, students will observe the effect of mass on velocity and momentum in elastic and inelastic collisions. Includes background reading, a student handout, and discussion...

This image from GRID-Arendal depicts the major circulation pattern of the ocean, illustrating interactions between temperature, salinity, and depth. Includes a background reading handout and several discussion questions.

In this interactive simulation of Ohm's law, adapted from the University of Colorado's Physics Education Technology project, students will adjust the voltage and resistance in a circuit, and observe how this affects the flow of current....

Featuring images of glacier formations, this interactive resource adapted from the National Park Service explains what glaciers are, where they are found, how they form, and how they move.

Nitrogen, one of the most abundant elements in the universe, is essential to life. This interactive activity adapted from the University of Alberta provides an overview of the nitrogen cycle. Includes background reading handout and...