Content from PBS Digital Studios

On the 15th anniversary of the attack, survivors and first responders share their vivid recollections of the day that changed the world.

Documentary which follows the construction of a trailblazing 36,000-tonne steel structure to entomb the ruins of the nuclear power plant destroyed in the 1986 Chernobyl disaster.

Determined to understand the repeating patterns he was finding in nature, French mathematician Benoit Mandelbrot used an early form of computer imagery to produce his own versions, coining the recurring shapes fractals. This installment of the PBS series "Nova" examines the rules of these self-similar patterns and explores the ways these fascinating geometric configurations can be applied in the fields of science, medicine and the arts.

In this documentary, filmed throughout the U.S., Asia, and South America and originally aired on PBS Television, singer Alanis Morissette narrates as documentary filmmakers profile the people whose lives have been affected by global warming and explore the efforts made by scientists, individuals, and communities to make the planet safe for future generations. This documentary profiles people who are living with the grave consequences of a changing climate, as well as the individuals, communities and scientists inventing new approaches to safeguard our children's future. Filmed across the U.S., Asia and South America, this program brings the reality of climate change to life and offers viewers a variety of ways to make a difference in their own communities.

What is weakening Earth’s invisible shield? Magnets have the power to attract and repel—sometimes on a massive scale. The Earth’s molten core—a violent mix of searing heat, crushing pressure, and a billion trillion tons of liquid iron—creates an invisible shield that surrounds the globe, guarding against a constant barrage of deadly radiation from space. But over the last few decades, the Earth’s magnetic field has weakened dramatically, intriguing scientists across the globe. The power generated 2000 miles beneath our feet protects us every day, but the loss of Earth’s magnetic field is a brewing storm that affects us all. While experts research and debate, persistent questions remain. Is a rare geomagnetic reversal the cause of earth’s inner turmoil? And if the magnetic field were to vanish altogether, would Earth become as lifeless as Mars?

The story of South Africa’s sardine run is brought vividly to life on camera.

Paul Robeson: Here I Stand presents the life and achievements of an extraordinary man. Athlete, singer, and scholar, Robeson was also a charismatic champion of the rights of the poor working man, the disfranchised and people of color. He led a life in the vanguard of many movements, achieved international acclaim for his music and suffered tremendous personal sacrifice. His story is one of the great dramas of the 20th century, spanning an international canvas of social upheaval and ideological controversy.

Nova follows the creation of a katana from raw iron ore to finished masterpiece, through the hands of fifteen master artisans as scientists explain the chemistry and physics at each step that makes it a superb piece of engineering.

Join NOVA on a voyage beneath the waves, where you'll discover a bizarre, alien-like creature like no other. It's an animal with eight sucker-covered arms growing out of its head, three hearts pumping its blue-green blood, and a doughnut-shaped brain. It has the ability to change its color and shape to blend in with seaweed and rocks, and it has a knack for switching on electrifying light shows that dazzle its prey. Perhaps most surprising of all, this animal is quite intelligent, with a highly complex brain. In this program, underwater cameras capture the extraordinary powers of the cuttlefish.

Marking the 20th anniversary of 9/11, this intimate film follows the life stories of six young people whose dads died in the attacks, before their kids ever got to know or even meet them

The hamburger has been an American icon, a popular food product, and now, the subject of this fascinating documentary, BURGER TOWN. Since its origins, this round pattie of beef has been a staple of American food, and soon after became an icon of popular culture. This hour-long video explores the unique history of the hamburger in the United States, focusing on Los Angeles's importance in its popularization, and in the success of fast food in general. Richard McDonald, founder of the food chain, is one of the many hamburger "historians" interviewed in this enticing film.

The world is full of monsters, myths, and legends and Monstrum isn’t afraid to take a closer look. The show, hosted by Emily Zarka, Ph.D., takes us on a journey to discover a new monster for each new episode. Monstrum looks at humans unique drive to create and shape monster mythology through oral storytelling, literature and film.

Space Time explores the outer reaches of space, the craziness of astrophysics, the possibilities of sci-fi, and anything else you can think of beyond Planet Earth.

Join hosts Hank Green, Kallie Moore, and Blake de Pastino as they take you on a journey through the history of life on Earth. From the dawn of life in the Archaean Eon through the Mesozoic Era — the so-called “Age of Dinosaurs” -- right up to the end of the most recent Ice Age. The evolutionary history of mammals including humans and other modern species is explored with these amazing paleontology experts.

Here's an idea: a PBS show that examines the connections between pop culture, technology and art.

Rooted in tradición mexicana and infused with Texas food culture, tacos are some of Texans’ all-time favorite foods. In The Tacos of Texas, the taco journalists Mando Rayo and Jarod Neece take us on a muy sabroso taco tour around the state as they discover the traditions, recipes, stories, and personalities behind the diverse tacos styles all over Texas.