Fannie Lou Hamer was sterilized without her knowledge or consent in 1961. She would become a leader of the Mississippi Civil Rights movement. Learn more with this biography from American Experience: "Freedom Summer." This resource is part of the American Experience Collection.

This video segment from Swift: Eyes through Time introduces and explains theories of the origin of gamma-ray bursts.

In this video segment from Garden Insects, learn about six varieties of spiders that live in one garden.

This video segment from Outdoor Nevada looks at the Gila monster's behavior, habitat, and unique adaptive characteristics.

Learn about the lives of gorillas born in captivity in this video segment from Nature.

In this video from ThinkTV Dayton, learn about Harriet Beecher Stowe and the basis of her famous book, Uncle Tom's Cabin, that documented racial injustice before the Civil War.

In this video from Outdoor Nevada, learn about the habitat, diet, and defense mechanisms of horned lizards.

This video segment adapted from KET's Where the River Bends demonstrates how climate change and glacier movement during the Ice Ages destroyed the old Teays River and created the Ohio River, Kentucky's northern border.

Meet two sisters who have migrated from Poland to Ireland, one of three countries in the EU that welcomes immigrant workers from Eastern Europe, in this Wide Angle video.

In this Wide Angle video segment, a young Indian girl talks about her life, family, education and daily routine.

This animation from KET's distance learning physics course demonstrates the mathematical formula for a scientific law as it applies to light.

In this video from Science City, meet a forensic scientist. She describes the steps to recover and analyze fingerprints to help solve crimes. She also discusses common attributes between art and science.

Three billion years ago single-celled underwater bacteria used sunlight to convert carbon dioxide and water into tiny oxygen bubbles. Soon plants were turning an atmosphere full of volcanic carbon dioxide into oxygen. As we learn in this video segment from Interactive NOVA: "Earth," photosynthesis created a good home for animals and humans, though not for some primitive organisms. They had to retreat to where oxygen couldn't reach them. Join researchers as they search for these organisms, now considered tiny time capsules from a time before there was oxygen on Earth.

This video segment from Between the Lions uses a line of laughing Lions to help build vocabulary and illustrate the meaning of words that typically challenge young children.

This video segment from a WPSU documentary Liquid Assets connects public health to the availability of clean and safe drinking water and elaborates on the threats our bodies face due to increasing kinds and quantities of pollutants.

This video segment from Between the Lions features a catchy song that celebrates an important function of literacy: access to information. It also shows the wide world of print, and all of the knowledge that can be gained from it.

This video segment of Swift: Eyes through Time provides concrete examples to explain the concept that distance in space equals distance in time.

This video segment from New York Voices features Chinese American architect Maya Lin.

In this activity, students will focus on dividing fractions, starting with single-digit denominators and working up.

Migrant construction workers from rural China describe their living conditions in Beijing in this Wide Angle video segment.