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RESOURCE	GRADE LEVEL	MEDIA TYPE
The Dancing, by Gerald Stern In this video segment from Poetry Everywhere, Gerald Stern reads his poem, "The Dancing", which moves from pleasant memories of the poet’s childhood to the horror of World War II. Accessibility features: Caption	7-12	Video
Dark Energy In this video adapted from QUEST, learn about the discovery of a form of energy, called dark energy, which has the potential to alter our theories of how the universe is structured. Accessibility features: Caption	10-12	Video
Darwin: Reluctant Rebel This video segment from Evolution: "Darwin's Dangerous Idea," together with interviews with Daniel Dennett and James Moore, depicts Darwin struggling with publicizing his revolutionary theory. Accessibility features: Caption	9-12	Video
Dating Lava Flows on Mauna Loa Volcano, Hawaiʻi In this video segment adapted from NOVA, scientists search for carbonized remains of plants preserved in lava flows to find out how long it has taken rain forests on Hawaiʻi to regenerate after a volcanic eruption. Accessibility features: Audio Description, Caption	3-12	Video
Dealing with Controversy In this video segment from Teaching Evolution Case Studies, science teachers explore how controversy may arise in teaching evolution in the public school classroom. Accessibility features: Caption	K-12	Video
Dealing with Rejection In this video from the Broadway or Bust website, coaches and young performers share how they cope with rejection. Accessibility features: Caption	6-12	Video
Dealing with Stage Fright In this video from the Broadway or Bust website, coaches and students comment on how to manage stage fright. Accessibility features: Caption	6-12	Video
Debating Slavery In this video segment adapted from Africans in America, learn how the issue of slavery shaped the debate at the U.S. Constitutional Convention. Accessibility features: Caption	5-12	Video
Deciphering the Maya Code This video segment adapted from NOVA examines the ancient Maya writing system and looks at what they recorded in their writings. Accessibility features: Caption	5-12	Video
Decision-Maker Bees and the Human Brain Learn about the similarity between the pattern of communication within a bee colony and neural networks in the human brain, in this video adapted from NOVA scienceNOW. Accessibility features: Caption	6-12	Video
Decision in the Streets This video segment, adapted from Decision in the Streets by civil rights filmmaker Harvey Richards, portrays the interracial protests that took place in San Francisco in 1963-64. Accessibility features: Caption	9-12	Video
Declaring Freedom...But For Whom? In this video segment adapted from Africans in America, consider the American view of freedom that was defined by Thomas Jefferson in the Declaration of Independence. Accessibility features: Caption	5-12	Video
Decomposers Without the work of decomposers, living organisms would eventually use up all the raw materials in the environment, and dead organisms and wastes would pile up. This video segment from Interactive NOVA: "Earth" describes the role of decomposers as the Earth's great recyclers. Accessibility features: Caption	K-5	Video
Deep in the Swamp This video segment from Between the Lions is an animated version of the trade book “Deep in the Swamp” set to music. It focuses on numbers and animal vocabulary words. Accessibility features: Caption	Pre-K-1	Video
Deep-Sea Vents and Life's Origins Deep-sea vents are home to life forms that do not rely on the Sun's energy. They depend instead on energy from volcanoes on the ocean floor. This video segment adapted from NOVA hypothesizes that life on Earth may have begun in this extreme environment. Accessibility features: Audio Description, Caption, Transcript	3-12	Video
Deep Sea Vents and Life's Origins Deep-sea vents are home to strange, luminescent life forms that thrive through chemosynthesis. This video segment from NOVA: "Volcanoes of the Deep" hypothesizes life's beginnings in this extreme environment. Accessibility features: Audio Description, Caption, Transcript	3-12	Video
Deep Time In this video a Penn State professor refers to National Park canyons carved out by water and wind as he explains “deep time” - the notion that the earth is billions of years old; another professor states how the theory of evolution is supported by evidence of an ancient Earth recorded in rocks. Accessibility features: Caption	6-12	Video
Defy Gravity! Balancing Balls on Air In this video segment adapted from ZOOM, cast members use a hair dryer to balance a ball in a stream of air, seemingly defying gravity. Accessibility features: Caption, Transcript	K-8	Video
Defy Gravity! Centripetal Force How can you keep a ball from falling out of a jar if the jar is upside down? Watch the ZOOM cast use centripetal force to meet this challenge. Accessibility features: Caption, Transcript	3-8	Video
Defy Gravity! Upside Down Ping Pong Ball In this video segment, the ZOOM cast is challenged to keep a ping pong ball in a funnel while the funnel is held upside down, seemingly defying gravity. Accessibility features: Caption	3-8	Video
Dendroclimatology in the Navajo Nation 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. Accessibility features: Caption	6-12	Video
Dengue Virus Invades a Cell 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. Accessibility features: Caption	9-12	Video
Density and Buoyancy: Experimenting with Club Soda In this video segment adapted from ZOOM, the cast discovers that gas-filled bubbles act like life jackets for raisins, making them buoyant. Accessibility features: Caption, Transcript	K-8	Video
Density and Buoyancy: Making Eggs Float Why does an egg float in salt water? Learn about density and buoyancy in this video segment adapted from ZOOM. Accessibility features: Caption	K-8	Video
Density and Buoyancy: Mixing Hot and Cold Water Watch warm water float on top of cold water in this video segment adapted from ZOOM. Accessibility features: Caption, Transcript	K-8	Video
Density and Buoyancy: Pouring Air into Water This video segment adapted from ZOOM offers a clever demonstration of buoyancy by showing how to pour a cup of air into a cup filled with water. Accessibility features: Caption, Transcript	K-8	Video
Density and Buoyancy: Testing Liquids Will a grape float in oil? Will a metal nut sink in corn syrup? Watch as the ZOOM cast tests the buoyancy of a variety of liquids and objects. Accessibility features: Caption, Transcript	K-8	Video
The Deployable Energy Absorber Watch how engineers stage a crash to test a new helicopter safety design technology in this video from NASA. Accessibility features: Caption	9-12	Video
Desert Biome This video segment from NOVA: "A Desert Place" describes the physical characteristics and organisms that define the desert biome. Accessibility features: Audio Description, Caption, Transcript	3-12	Video
Desert Habitat This video segment from IdahoPTV's D4K defines warm and cold (high) deserts, and describes some of the plants and animals found there as well as their adaptations for living in each type of desert. Accessibility features: Caption, Transcript	4-6	Video
Desert Tortoise This video segment from Outdoor Nevada examines threats to the desert tortoise population. Accessibility features: Caption	K-12	Video
Design for Function In this video segment from Cyberchase, the CyberSquad designs an invention that will help them cross a swamp and also reach the top of a tall cliff. Accessibility features: Caption, Transcript	3-5	Video
Designing a Paper Bridge 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? Accessibility features: Caption	3-8	Video
Designing a Puff Mobile The air you exhale can power a puff mobile. Watch as the ZOOM cast races their air-powered designs to see which design features are the most successful. Accessibility features: Caption, Transcript	K-5	Video
Designing a Roller Coaster This video adapted from DESIGN SQUAD profiles Chris Gray, a mechanical engineer who uses his knowledge of energy transfer to design roller coasters. Accessibility features: Caption	5-12	Video
Designing a Roller Coaster In this video segment adapted from ZOOM, the cast is challenged to design and test a roller coaster with loops, hills, and U-turns. Accessibility features: Caption	3-5	Video
Designing Balloon Cars Can the air in a balloon power a car? Watch students from Weston, Massachusetts, demonstrate their balloon car designs in this video adapted from ZOOM. Accessibility features: Caption, Transcript	3-8	Video
Designing Electric Circuits: Door Alarm In this video segment adapted from ZOOM, cast members design and build door alarms using a variety of materials, including aluminum foil, batteries, and buzzers. Accessibility features: Caption	3-8	Video
Designing Electric Circuits: Steadiness Tester In this video segment adapted from ZOOM, cast members discover that metal is a good conductor of electricity as they play the steadiness tester game. Accessibility features: Caption	3-5	Video
Designing Future Cities: Alternative Energy In this video segment adapted from ZOOM, visit a class as they design a city of the future that will use solar, wind, and water power to fuel its economy. Accessibility features: Caption, Transcript	3-8	Video
Designing Swimming Prosthetics for a Dancer In this video segment adapted from DESIGN SQUAD, teams of high school kids use the engineering design process to build specialized prostheses for a double-amputee dancer who performs underwater. Accessibility features: Caption	6-12	Video
Designing the Citigroup Skyscraper This video segment adapted from Thinking Big, Building Small shows how a structural engineer overcame the challenge of building New York's Citigroup skyscraper over a church. Accessibility features: Caption, Transcript	3-8	Video
Designing a Wheelchair for Rugby In this video segment adapted from DESIGN SQUAD, teams of high school kids use the engineering design process to build an automated wheelchair to help a U.S. Paralympic athlete train. Accessibility features: Caption	6-12	Video
Design Squad: Sound In this video segment adapted from Design Squad—a PBS TV series featuring high school contestants tackling engineering challenges—learn about the fundamentals of sound as student teams create percussive and stringed instruments for a local band. Accessibility features: Caption	3-12	Video
Design Squad: Suspension Bridge In this video segment adapted from Design Squad—a PBS TV series featuring high school contestants tackling engineering challenges—students employ the concepts of tension and compression to build a suspension bridge without the aid of power tools. Accessibility features: Caption	5-12	Video
Design Squad: Truss Bridge In this video segment adapted from Design Squad—a PBS TV series featuring high school contestants tackling engineering challenges—students employ the concepts of tension and compression as they build a truss bridge without the aid of power tools. Accessibility features: Caption	5-12	Video
Detecting Life on Other Planets In this video from NOVA scienceNOW, learn how scientists detect potential signs of life on distant planets. Accessibility features: Caption	6-12	Video
Developing the Periodic Table This video excerpt from NOVA: "Hunting the Elements" looks at how early chemists developed the periodic table of elements. Accessibility features: Caption, Transcript	6-12	Video
Diane Nash and the Sit-Ins Diane Nash was a college student when she started leading sit-in demonstrations to protest discrimination. In this interview, recorded for Eyes on the Prize, Nash describes her role in the Civil Rights movement. Accessibility features: Caption, Transcript	6-12	Video
The Diary of Anne Frank This resource featuring three video segments from “The Diary of Anne Frank” dramatizes several moments in Anne’s life in hiding from the Nazis during World War II, as described in her diary. Accessibility features: Caption	5-12	Video