This video [1:57] from the American Masters film Ralph Ellison: An American Journey explores the relationship between the fictional Brotherhood in the novel Invisible Man and the real-life Communist Party. Both Ellison and his literary mentor Richard Wright were associated with the Communist Party earlier in their careers, but later left because of political and artistic differences. Teaching materials are included.

This 1954 statement, issued by a group of black educators, strongly endorses the Supreme Court's Brown ruling.

This sampling of newspaper editorials from the mid-1950s reflects the range of public opinion and responses to the Brown decision.

Bruno Mars sings an inspirational melody all about perseverance. When something is new and difficult, it's important not to give up. Keep trying and you'll succeed! [1:57]

In this video segment adapted from A Science Odyssey, learn about bubonic plague and how city officials in San Francisco tried to contain its spread in the early 1900s..

In this video segment adapted from A Science Odyssey, learn about bubonic plague and how city officials in San Francisco tried to contain its spread in the early 1900s. [5:06]

In this interactive activity from Shedd Aquarium, build a fish and then release it into the reef to search for food and evade predators. Try different combinations and observe how each kind of fish has unique adaptations that help it survive in its habitat.

In this interactive activity from Shedd Aquarium, students will build a fish and then release it into the reef to search for food and evade predators. Students will try different combinations and observe how each kind of fish has unique adaptations that help it survive in its habitat.

Students learn how various kinds of data and information can be gathered to create a biodiversity timeline that serves as evidence of changes in a population of a species.

This NASA video showcases Curiosity, NASA's Mars rover that will, over a 23-month mission, collect and analyze Martian soil and rock samples while traversing a targeted area of the planet testing for evidence of current or past life. [1:59]

Steve Hinds demonstrates how a brief discussion of money and decimals can help students to shed common misconceptions about decimal place value.

Choose from several videos that center around social skills such as making friends, solving problems, and working together for a common goal.

In this video segment adapted from ZOOM, the cast shows how the 34 steps in their Rube Goldberg invention use everything from gravity to carbon dioxide gas in order to accomplish one simple task: pouring a glass of milk.

In this video segment from ZOOM, Jillian explains how her simple machine uses marbles, levers, flowing sand, and a spinning wheel to water a plant.

In this video segment from ZOOM, Jillian explains how her simple machine uses marbles, levers, flowing sand, and a spinning wheel to water a plant. [1:16]

In this video segment from WGBH, children make a dam with dirt, sticks, and stones to try to stop the flow of water.

In this video segment from PEEP and the Big Wide World, children make a dam with dirt, sticks, and stones to try to stop the flow of water.

Recall the definitions of four different sets of numbers. This interactive illustration focuses on displaying counting numbers, integers, rational numbers, and real numbers on a number line, providing the opportunity to visualize number sets in multiple ways.

How do you build a tunnel 32 miles long--under water? This video segment, adapted from the PBS series "Building Big," follows the construction of the Channel Tunnel (nicknamed "Chunnel"), the engineering wonder that connects England to France. [5:01]

How do you build a tunnel 32 miles long -- under water? This video segment adapted from Building Big, follows the construction of the Channel Tunnel (nicknamed "Chunnel"), the engineering wonder that connects England to France.