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Since the beginning of time, humans have used chemical reactions without understanding them. For example, ancient Greek artisans were able to smelt metal, dye fabrics, and make glass. The attempt to transform simple metal into gold and silver was known as alchemy (the forerunner of chemistry as we know it today). By mixing elements, alchemists created chemical reactions which produced new compounds. While alchemists were never able to transform anything into gold or silver, their trails helped shape the science of chemistry. Part of Chemistry: Solved by Sherlock Olmos Series.
(Source: DCMP)
It is late spring on Kodiak Island, Alaska, and all eyes are on the horizon for one of nature’s most graceful giants: the gray whale. It is here that they begin and end the longest migration of any mammal. They will travel 12,000 miles from the icy waters of the Arctic to the warm lagoons of Baja, Mexico, and back again. Today, nearly 24,000 gray whales continue their annual migration along the coast of North America giving humans a glimpse of these majestic creatures that live in the deep.
Ten thousand years ago, corn didn’t exist anywhere in the world, and until recently scientists argued vehemently about its origins. Today the crop is consumed voraciously by humans, by livestock, and as a major part of processed foods. So where did it come from? Evolutionary biologist Neil Losin tells the story of the genetic changes involved in the transformation of a wild grass called teosinte into corn. Evidence from genetics supports archeological findings pinpointing corn’s origins to a very particular time and place in Mexico.
Since the time of the ancient Greeks, humans have been using spider silk to dress wounds. Scientists now know spider webs not only have healing qualities, they can be stronger than steel. University of Wyoming Molecular Biologist Randy Lewis adds an almost science fiction aspect to the study of spider silk: making large quantities of it by “growing it” in goat’s milk. With funding from the National Science Foundation, Lewis has cloned and sequenced genes for the proteins that make up five different spider silks, some stronger than Kevlar, others more elastic than nylon.
Powerful forces have forged the conditions on Earth that have made life possible. The millennia have been witnesses to the formation of the planet: its singular position in relation to the sun, the evolution of the continents, and the birth of entire mountain chains. All of these elements combine to create Earth’s constantly changing climate. Homo sapiens emerge into this unpredictable and violent world, fighting for survival from the start. It is these early humans’ ability to adapt that allows them to triumph even in the face of incredible adversity and sets the path for modern man. Part of the "How Climate Made History" series.
Consider the following: humans live twice as long as their ancient ancestors did even though their bodies contain different types of synthetic and sometimes toxic substances. This is an unpleasant part of life in the modern age. Explores the health impact, wide variety, and alarming ubiquity of manufactured chemicals. Shows how communities around the world, including Inuit seal hunters, Asian and African farmers, and residents of an industrial town in the United States address the pervasiveness of molecular compounds found in pesticides, plastics, and other products. The benefits of these chemicals are weighed against their dangers.
The parakeet starts with a monologue about games and sports. The first guest, the turtle is very concerned that the tradition of the annual race of the turtle and the hare, or hare relatives, may be lost if the race is not done this year. The rabbit doesn't want to race because last year he lost, and the turtle rubbed on his face the whole year. The fleas present a documentary about how important it is for humans to win. The celebrity guest, a tropical pop singer who likes flowers, tells us how he felt every time he was nominated for an award winning musical but didn't win.
If the sun instantly switched off like a light bulb, it would take almost 8 and a half minutes before humans on Earth realized what happened. Light travels at the fastest speed there is, but it still takes almost 500 seconds to get to Earth. This means the sunlight that reaches Earth is old. How is that possible? It is due to the concept of random walks. Part of the “It’s Okay to Be Smart” series.
Parakeet talks about the importance of proper animal treatment. The first guest, the dog, accuses cat of wanting to steal his master. The cat says he's just looking for a home and since the dog's master has adopted him and doesn't abuse him like his old masters, he doesn't think he's doing anything wrong. The fleas show a documentary on animal abuse and how humans often abuse and abandon their pets. The celebrity guest, Babe the brave little pig, talks about an experience on a farm which can be useful when compared with the story of the dog and cat. Babe explains the farmer shares his love with all 20 of his animals.
The parakeet starts without a script because Boronitas, the screenwriter, is sick. Amanda decides to improvise and presents the guest: the rabbit, who failed the school year because the llama failed to turn in an assignment. When the llama arrives with the script, they tell her it's already late and complain about her lack of responsibility. She explains that she took too many jobs at a time and failed to comply. Then Eva and Maite say they don't understand why humans say yes to everything, even bad things like smoking, drinking, and others. the celebrity guest, Maradona former soccer player, who said no to food. At the end the parakeet explains the importance of learning to say no.
Throughout history, Soccer has united all the numerous countries and communities in a single festivity. While soccer has a long history and tradition, the sport also embraces technology to keep it at the forefront of the sporting world.
Vanderbilt University researchers say they're working to unleash an insect repellent on mosquitoes that’s more powerful than DEET. The discovery could one day be effective in reducing the spread of mosquito-borne diseases, such as malaria. It's based on a mosquito's sense of smell. With support from the National Science Foundation, Vanderbilt University biologist Laurence Zwiebel researched which mosquito genes are linked to odor reception. He discovered a separate odor sensor on a mosquito's antennae. According to Zwiebel, mosquitoes use odor sensors to sniff out humans and other tasty animals to bite. The new insect repellent compound takes advantage of his discovery by overwhelming the mosquito’s odor sensors to the point that they can't smell anything else and get scared away.
February is Black History Month. Marvie is learning about different African-American inventors, and she is inspired to invent something new. Part of the "Marvie" series.
Parakeet talks about the importance of water for animals. Amanda chokes on an "almojabana" (cheese roll) and asks for a glass of water, but is told there is no water. The first guest, the wolf, says he could not finish bathing because the water ran out; he is still full of soap. He accuses the duck of using up all the water because she's always wet. The duck explains she, too, has no water, and someone else must be responsible for the drought in the forest. The fleas show a documentary on water and explain how humans waste it thinking it will never end. Ludovico interview some otters. The celebrity guest, Crispiano Donaldo, says his team lost a soccer game because he drank all the water and left his teammates dehydrated.
Investigates the reasons why cattle and humans have been linked together for over 30,000 years. Analyzes the anatomy of the cow's stomach, detailing the purpose of each chamber. Visit the Masai with their cattle herds and the sacred cows of India. Introduces the main cattle breed of the 800 breeds developed in England, explaining how artificial selection is used to produce desirable characteristics. Also introduces British dairy cow detailing the working of the udder and teats and the use of genetic engineering to increase milk production. Interviews Eric Schlosser, an author about the development of slaughterhouse methods in America. Also visits a family ranch where cattle are being raised in natural conditions under a grass management system.
What are the different features of each instrument? While attending a concert by the Youth Orchestra of Bariloche, a team analyzes the different scientific and technological aspects related to sound and music. Part of Invisible Science and Technology Surrounding Series.
Most pet owners talk to their animals at one time or another, and some do every day. But, how much do pets actually understand? Is their perception anything like our own? These are the questions that fascinate Irene Pepperberg and she’s looking for answers from the animals themselves, specifically – African Grey Parrots. The Harvard psychology professor is a bit like the character Dr. Doolittle because she’s been talking to parrots for decades. With help from the National Science Foundation, she’s researching how much the birds understand about shapes, numbers, and colors. Her next phase of research involves how the parrots detect optical illusions, and whether they perceive them the way humans do. Her research will also reveal more about how a bird’s vision works.
Host Trace Dominguez discusses a science experiment involving spiders and their webs. Some scientists sprayed spiders with graphene, which they absorbed and added to their webs. This created the strongest fiber known to humankind.
The 1960s world population has nearly doubled and now tops 7 billion. Population growth, though little discussed, is putting an unprecedented burden on the planet's life systems. Brings to light the connection between overpopulation and our most pressing environmental and humanitarian problems, as well as the solutions. Also, follows Beth, an American mother and child rights advocate, who grew up in a large family of 12 as she travels to Africa to witness first-hand the impact of population growth in the developing world and its role in exacerbating poverty. While there, she meets a young Ethiopian woman, Zinet, who comes from a poor family of 12, but has found the courage to break free from long-held cultural barriers holding back women. Features a broader discussion of the solutions to overpopulation in both the developed and developing world.
May Day is a celebration of the arrival of spring. Communities host festivals with food and dancing around a maypole. Part of the “All About the Holidays” series.
Showing collections 1 to 6 of 6
Collection of anatomy resources
A collection containing 21 resources, curated by Benetech
Biology related concepts
A collection containing 59 resources, curated by Benetech
Resources related to vision
A collection containing 12 resources, curated by Charles LaPierre
Resources to teach younger students about animals
A collection containing 58 resources, curated by DIAGRAM Center
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech
A collection of simulations from PhET.
A collection containing 15 resources, curated by Charles LaPierre
