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Gravity rules the life cycle of stars. During the Red Giant dying stage in the life of an average size star, its outer layers are blown off in vast clouds of dust and gas called "nebulae" that contain hydrogen, oxygen, and nitrogen. Gravity crushes the remaining atoms into a remnant core called a white dwarf. The gravity of giant stars-10 to 20 times larger than average-will, at the end of their life in a supernova explosion, crush together even mutually repulsive protons and electrons, leaving a remnant rotating core of neutrons (i.e., a pulsar). Also explains how stars 20 to 100 times average size collapse into a core so dense that its gravity doesn't even allow light to escape (i.e., a black hole).
(Source: DCMP)
Scientists learn the basic properties of stars by analyzing the light they emit. Clarifies how brightness and luminosity are determined, discusses stellar parallax, and explains star color and characteristics. Focuses on yellow, blue, and red stars, white dwarfs, red giants, black holes, and supernovae.
Dwarf planets are a lot like regular planets. They both have enough mass and gravity to be nearly round, and they both travel through space in a path around the Sun. However, the path of the dwarf planet is full of objects like asteroids. A regular planet has a clear path around the sun.
What weighs 6,000 pounds, has poor vision, and a horn growing on its nose? A rhinoceros, of course! Solio Ranch in Kenya is a private wildlife sanctuary for black and white rhinos. Explains the differences and similarities between these animals, and notes poachers want only the rhino's horn for Asian and Middle Eastern markets. Shocking statistics emphasize the urgency to protect this unique species. NOTE: One brief mating scene.
Moko is an explorer. As he travels the world continent by continent, he makes many friends and discovers many natural phenomena which sometimes delight him, and other times scare him. Each animated episode recounts an adventure and takes an "original story" approach to explaining these natural phenomena. In this episode, the storm has passed and Moko's raft is approaching a new shore. He has never seen this white sand beach and wonders where he might be. Moko wanders off to find inhabitants of this new place. Along his route he passes plants with enormous leaves and at the other end of his path, the beach once again! How is this possible? What is the secret of this strange islandy? Night falls and Moko falls asleep convinced that he is the first traveler to discover the ocean's secret island.
In Japan, researchers have created a super productive egg layer. The white leghorn hen has lost its instinct to parent due to selective breeding. They abandon the eggs that they lay so energy and time is not spent on caring for a chick. These hens are able to concentrate solely on laying eggs.
Self-taught scientists and engineers, Wilbur and Orville Wright taught the world how to fly and are one of America’s greatest success stories. Their first successful flight, on North Carolina's Outer Banks, took place in December 1903. Next, they returned to Dayton, Ohio and continued to develop and test the world's first practical airplane.
Paleoanthropologist Dr. Tim White discusses how his team unearthed the fossil of Ardipithecus ramidus, an early hominid that lived about 4.4 million years ago. Dr. White discusses the fossil record and hominid evolution.
Moko is an explorer. As he travels the world continent by continent, he makes many friends and discovers many natural phenomena which sometimes delight him, and other times scare him. Each animated episode recounts an adventure and takes an "original story" approach to explaining these natural phenomena. In this episode, on that morning, Moko was helping his friend and the other villagers to cut firewood to heat their homes. Snow begins to fall, and Alarick tells Moko that it would be best if they went back inside. But Moko wants to learn the secret of the snow. He heads toward the mountain. At the summit, he sees large trees bending in the wind and clouds of snow swirling around in the sky. As he makes his way back down to the village, the storm blocks his way and he can go no further. Moko begs with the mountain to let him through, promising to tell no one the mountain's secret. The storm calms and Moko returns to the village. When Alarick asks him what he has learned, Moko tells him that the mountain's secret is not one that can be revealed.
Moko is an explorer. As he travels the world continent by continent, he makes many friends and discovers many natural phenomena which sometimes delight him, and other times scare him. Each animated episode recounts an adventure and takes an "original story" approach to explaining these natural phenomena. In this episode, Moko crosses the plains of Siberia and gets his first taste of the cold. After having found shelter in a cave for the night, he wakes to find a carpet of snow stretching out over the landscape as far as his eyes can see. Amazed at first, Moko realizes that he can no longer see his path and find his way. Could he have found the end of the world where distracted travelers get lost? At which point he notices footprints leading to a village.
Norvin is a good actor and a terrific swimmer, but he has a face that looks like a shark. He uses his acting talents and a fake fin to scare swimmers out of Caramel Cove so he can have it all to himself. He is so convincing, he eventually finds himself the love object of a female shark. Animated version of the book by Margaret Mahy.
Diagram of the internal organs of a frog as shown in a dissection. Design modalities for the image include braille with and without labels, print with and without labels in greyscale, color, and texture.
(Source: Benetech)
In this episode, host Dianna Cowern tackles the phenomenon of white rainbows. They are also known as spider web rainbows, and Dianna explains how these form. Part of the "Physics Girl" series.
In September 2005, members of an ocean exploration captured video footage of the white deep-sea octopod, Grimpoteuthis bathynectes. They nicknamed the octopod “Dumbo” because of its large ear-like fins. These fins and webbed arms help it swim through the water.
Describes how the sound and pictures from a live event get from the camera to the home television screen. Provides a history of television, explaining the switch from black and white to color. Notes the advantages of digital signals over analog. Considers the future of television. Looks at a new technique, digital video compression, in which television signals are received through phone lines.
Towering gypsum dunes span hundreds of square miles in New Mexico's White Sands National Monument, and hundreds of animal species thrive in this unique ecosystem. The lizards living in White Sands National Monument have attracted biologists from the University of California, Berkeley. The lizards are undergoing adaptation and speciation on an extraordinarily rapid timescale. Part of the “Science Nation” series.
Part of "The Living Oceans" series. Reveals the hunting habits of the ocean's deadliest predators: sharks. Captures the mating habits of hammerhead sharks and the hunting habits of blue sharks, six-gilled sharks, sand-tiger sharks, and white-tipped reef sharks. Explores the great white shark hunting seals and sea lions near the Farrallon Islands, explaining that the bloodthirsty animal culls out animals that are weak or ill.
In the jungles of central Africa where primatologists discovered that the deadly Ebola virus has not only emerged again among wild gorillas, but also spread to humans. Join a team from National Geographic on a trek into the jungle to investigate the source of this fearsome virus. A few gorillas that survived the outbreak could reveal Ebola's source and help scientists prevent it from infecting humans. Segment of video from Wild Chronicles Series.
Snakes certainly make it look easy when they slither forward, leaving perfect S-curve tracks behind them, but scientists have long been puzzled by the mechanics of their locomotion. Now, after a series of experiments and some computer modeling, David Hu has cracked the case. With funding from the National Science Foundation, he’s using math to determine how snakes slither and it turns out they move in a much different way than scientists have long thought.
Charles Drew set a standard of excellence unparalleled by most of his white contemporaries. In 1943, his distinction in his profession was recognized when he became the first black surgeon to serve as an examiner on the American Board of Surgery. Despite the prejudices of American society in the first half of the 20th century, Charles Drew persevered in his practice and was never afraid to stand up for his beliefs and racial equality.
Showing collections 1 to 6 of 6
3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna
Collection of anatomy resources
A collection containing 21 resources, curated by Benetech
Resources to teach younger students about animals
A collection containing 58 resources, curated by DIAGRAM Center
Resources related to vision
A collection containing 12 resources, curated by Charles LaPierre
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech
Biology related concepts
A collection containing 59 resources, curated by Benetech
