This interactive activity from ChemThink takes a closer look at a covalent bond--how it is formed and how the sharing of two electrons can keep atoms together.

In this lesson, students will explore the role played by perspective and point-of-view in an examination of American slavery. Students will look at the early history of widespread slavery in colonial America, and the ways in which some Northern slaves chose to deal with their situation amidst the chaos of the American Revolution. Utilizing the PBS series SLAVERY AND THE MAKING OF AMERICA, students will examine the life of Titus, a runaway slave from New Jersey who led a band of guerilla soldiers for the British, and explore why and how African-Americans fought during the Revolution. Following their examination of Titus, students will utilize a variety of online interactive resources to examine the experiences of runaway slaves throughout the history of American slavery. As a culminating activity, students will creatively write journal entries from a variety of historical perspectives, including slave, runaway slave, slave owner, and British soldier.This lesson can be used as a pre- or post- viewing activity for the PBS series SLAVERY AND THE MAKING OF AMERICA, or as an independent lesson for the social studies/history classroom. A basic knowledge of the slavery in the United States, as well as a familiarity with the American Revolution, is required. (taken from the website)

In this video segment from Nature, crabs face numerous obstacles in their migration from their forest home to the Caribbean Sea.

Botanists and biologists work to create a DNA barcode library for plant life in this video segment from New York Voices.

Students learn how DNA fingerprinting has been used in criminal investigations and discuss the limitations of and problems with DNA testing.

In this interactive activity from the Building Big Web site, investigate dams in distress and decide if they should be repaired, removed, or left alone.

Learn about the Dance Theatre of Harlem is this segment from A Walk Through Harlem.

In this video from KQED's QUEST, find out how researchers have engineered a stove that is helping women in refugee camps in Darfur, Sudan.

Meet the Data Decoders—a team of scientists at the Solís-Lemus Lab who use math and computers to interpret huge amounts of data from biological experiments.

Resources available for learning about this lab include:
• Interactive cards designed to introduce students to scientists in a more personal way
• A video with a personal story that explains why the lab's research matters in real life
• Questions to consider that will spark connection, reflection, and conversation
• An interactive video experience where you can ask questions of scientists in the lab and learn about their research
• An inquiry-based activity that focuses on doing science, using some of the same science practices that the lab uses
• An educator guide with information about standards alignment, curriculum connections, and tips for using the media resources

These resources are part of Meet the Lab, a collection of educational resources for middle school science classrooms.

A third grade class in Wuhan province, China holds debates for the election of class monitor in this segment from Independent Lens.

In this video segment from Africa, Flora explains why she is content to return to the bush.

In this video from Wide Angle, learn about the farmers of Vidarbha in central India who have seen a loss in profits due to the high cost of borrowing money and the low prices for their crops in a globalized market.

In this video segment adapted from Navajo Technical College, meet a dendroclimatologist who studies the relationship between precipitation and tree growth in the Navajo Nation.

In this visualization adapted from the University of Massachusetts Medical School, discover the role that dengue viral proteins play in a human cell as the virus prepares to replicate.

A 1967 federal court order resulted in this document, which mandated school desegregation in Birmingham.

This video segment from NOVA: A Desert Place describes the physical characteristics and organisms that define the desert biome.

In this video from Nature, observe elephants trek across the desert to an isolated waterhole.

In this video segment adapted from ZOOM, cast members make a bridge from a single piece of paper. Will it be strong enough to hold a hundred pennies?

This video from Nature offers a description of desirable traits in beef and dairy cattle.

In this video from Wide Angle, learn about the conditions that have caused some Zimbabweans to leave their homeland for Botswana.