Discover what controls how fast tiny molecular motors in our body pull through a single strand of DNA. How hard can the motor pull in a tug of war with the optical tweezers? Discover what helps it pull harder. Do all molecular motors behave the same?

Students will predict bond polarity using electron negativity values; indicate polarity with a polar arrow or partial charges; rank bonds in order of polarity; and predict molecular polarity using bond polarity and molecular shape.

Explore molecule shapes by building molecules in 3D! How does molecule shape change with different numbers of bonds and electron pairs? Find out by adding single, double or triple bonds and lone pairs to the central atom. Then, compare the model to real molecules!

Explore molecule shapes by building molecules in 3D! Find out how a molecule's shape changes as you add atoms to a molecule.

Do you ever wonder how a greenhouse gas affects the climate, or why the ozone layer is important? Use the sim to explore how light interacts with molecules in our atmosphere.

Monroe brought a vision of an expanded America to his presidency"”a vision that helped facilitate the formulation of what has become known as the Monroe Doctrine. In this unit, students will review the Monroe Doctrine against a background of United States foreign relations in the early years of the republic.

Try the new "Ladybug Motion 2D" simulation for the latest updated version. Learn about position, velocity, and acceleration vectors. Move the ball with the mouse or let the simulation move the ball in four types of motion (2 types of linear, simple harmonic, circle).

Try the new "Ladybug Motion 2D" simulation for the latest updated version. Learn about position, velocity, and acceleration vectors. Move the ball with the mouse or let the simulation move the ball in four types of motion (2 types of linear, simple harmonic, circle).

Invite students to share and discuss a song of their choice with lyrics that contain a social, political or cultural message relevant to a contemporary social justice issue. Students will lead their peers through a close reading and discussion of the song’s lyrics, and create a written analysis of the song, its lyrics, and its message. To help anchor their analysis, teachers may use the Critical Literacy Text-Dependent Question Stems template in the lesson. Students can organize their writing along the eight areas, while choosing from the list of prompts in each area. (Note: Teacher discretion will be necessary for handling lyrics that use explicit language.) Use the suggested activity and strategies below to empower students to lead the lesson with their peers as the students.

Learn about position, velocity, and acceleration graphs. Move the little man back and forth with the mouse and plot his motion. Set the position, velocity, or acceleration and let the simulation move the man for you.

In this lesson, created in partnership with the Association for Cultural Equity, students gain a deeper understanding of what life might have been like for a working class person during this period of American history by examining the songs and stories of Nimrod Workman. Born in 1895, Workman began working in the West Virginia coal mines at fourteen years old, and continued for 42 years. By analyzing Workman's songs and personal stories, which were recorded by Alan Lomax in 1983, students gain a first-hand account of one of the most dangerous, violent, and least regulated industries in American history, and discover the relationships between labor, industry, and the government from the 1890s to the end of World War II.

In this lesson, created in partnership with the Association for Cultural Equity, students discover how the banjo and music making more generally among slaves contributed to debates on the ethics of slavery. They listen to slave narratives, examine statistics, and read primary sources to better understand how slavery was conceptualized and lived through in the 18th and 19th centuries. Throughout the lesson, students return to videos created by Alan Lomax of pre-blues banjo player Dink Roberts as a way to imagine what music among slaves in the United States may have sounded like.

In this lesson, created in partnership with the Association for Cultural Equity, students discover the causes, characteristics, and lasting effects of the Second Great Awakening by examining the biographies of historical figures associated within the movement. They also consider how Sacred Harp Singing represents the ideals of the Second Great Awakening by watching Alan Lomax's ethnographic videos of a Sacred Harp performance.

In this lesson, created in partnership with the Association for Cultural Equity, students trace how the French and Indian War led to the Acadians' displacement and their resettlement in Louisiana by examining historical maps and reading excerpts from Henry Wadsworth Longfellow's poem Evangeline: A Tale of Acadie. In addition, students will examine historical documents and ethnographic film clips from the Alan Lomax Collection to consider how music and dance has been a way for the Acadian/Cajun community to preserve their cultural and genetic lineage, even in the most perilous of circumstances.

Students examine and listen to a variety of forms of music to learn about the cultural, geographic, and stylistic diversity available within the United States.

This lesson traces the long history of how African Americans have used music as a vehicle for communicating beliefs, aspirations, observations, joys, despair, resistance, and more across U.S. history.

Build your own system of heavenly bodies and watch the gravitational ballet. With this orbit simulator, you can set initial positions, velocities, and masses of 2, 3, or 4 bodies, and then see them orbit each other.

Build your own system of heavenly bodies and watch the gravitational ballet. With this orbit simulator, you can set initial positions, velocities, and masses of 2, 3, or 4 bodies, and then see them orbit each other.

The NAACP fights to establish anti-lynching laws in the years between the World Wars

This lesson discusses the differences between common representations of Native Americans within the U.S. and a more differentiated view of historical and contemporary cultures of five American Indian tribes living in different geographical areas. Students will learn about customs and traditions such as housing, agriculture, and ceremonial dress for the Tlingit, Dinè, Lakota, Muscogee, and Iroquois peoples.