When Mount St. Helens erupted earlier this year, it focused the attention of the whole world on the almost incredible destructive forces that volcanos can release. Geologists from around the world congregated at the volcano and NOVA joined the vigil for an in-depth look at the incident and its aftermath.

NOVA examines a controversial theory that traces our ancestry to a small group of women living in Africa 300,000 years ago.

Harvard chemist George Kistiakowsky was an anti-Bolshevik soldier in 1919 Russia, an atomic bomb scientist at Los Alamos, a presidential advisor in the Eisenhower White House and an arms control activist. Shortly before Kistiakowsky death, he recounts his eventful career to interviewer Carl Sagan.

Whether they make you fat, fart, or freak out, microbes play a central role in your life. Right beneath your nose—on your face, in your gut, and everywhere in between—trillions of bacteria, viruses, and fungi are so abundant in your body, they outnumber your human cells. But these aren’t just nasty hitch-hikers. Many are crucial to your survival.

Sinister, sometimes even deadly, spiders have little popular appeal; yet their silken webs are among nature's loveliest creations. NOVA takes a close-look in slow motion, as spiders reveal a delicate grace and beauty, and an amazing array of lifestyles.

In a two-hour special, NOVA follows seven aspiring doctors through four years of medical school. The first examination, the anatomy lab, the first death, the first baby-it's all part of becoming a doctor. Neil Patrick Harris, star of ABC's Doogie Howser, MD hosts. (Follow-up to the program 1521 "Can We Make a Better Doctor?")

Sir David Attenborough hosts a never-before-seen look at one of the most misunderstood creatures in nature. Special photography, including infrared photography, exposes the secret life of the wolf pack.

In NOVA's special sequel to 1984's National Science Test, viewers can match wits with celebrity panelists David Attenborough, Michelle Johnson, Edwin Newman and Alvin Poussaint and a live studio audience. Art Fleming hosts.

NOVA joins the 50th anniversary celebration of the DC-3—the plane that revolutionized commercial air travel, served gallantly in World War II and is called the most important plane ever built.

Part one of a four-part series on the pioneers of modern surgery relives the early days, when surgery was practiced without the benefit of anaesthesia or antisceptics and patients usually died.

Once unthinkable, open-heart surgery is now an everyday miracle. NOVA looks at the brave doctors and patients who make it possible.

From kidneys to hearts, NOVA examines the daring attempts to replace diseased organs with transplanted ones.

Surgeons have always been eager to help patients, even at the risk of killing them. NOVA looks at some of the excesses of surgery, and at how new drugs and technologies are rendering some operations obsolete.

A famous brain surgeon struggles to save the life of a comatose child using a controversial new method of treating severe head injuries. In charge is Dr. Jan Ghajar, who gained notoriety in 1996 by successfully treating a woman who was savagely beaten in Manhattan's Central Park and expected to die. Dr. Ghajar believes the measure that helped save her life should be available to all.

Lionfish–long prized in home aquariums–have invaded the Atlantic, and are now one of the ocean’s most successful invasive species, wreaking havoc in waters across the globe. Join ocean explorer Danni Washington on a journey to find out how they took over, why they’re doing so much damage, and what can be done about it.

NOVA profiles two very different scientists: Richard Feynman, a theoretical physicist, at the pinnacle of his career—a Nobel prizewinner; and Richard Lewontin, a biologist and highly regarded population geneticist from Harvard University.

Author Isaac Asimov joins NOVA in the retelling of the remarkable story of the discovery of the structure of DNA. James Watson and his ex-colleague Francis Crick exchange memories of the events which led to their winning the race for the structure of the gene.

NOVA tells the story of still and cine photography in science—from the extraordinary work of the pioneers in the early 1800s to how the ability to freeze time on film in ever shorter periods has given scientists remarkable new insights. Today photography enables us to analyze (frame by frame) the thousands of molecular reactions that can happen in less time than the blink of an eye.

A distinctive feature of this stone site are the trilithons, which consist of two upright stones topped by a horizontal lintel stone. In this program, the NOVA team considers how to transport and raise the massive stones, as well as how to place the lintel stone on top. By comparing different strategies and adapting ramps, levers, and other tools that might have been available to the ancient builders, the team works to meet the challenge.

NOVA goes behind the scenes in Hollywood, where the art of illusion meets the science of perception.

The shattered remnants of the Roman city of Pompeii bear witness to the risk that the people of Naples still face today.

Apollo astronauts and engineers tell the inside story of Apollo 8, the first manned mission to the moon. The U.S. space program suffered a bitter setback when Apollo 1 ended in a deadly fire during a pre-launch run-through. In disarray, and threatened by the prospect of a Soviet Union victory in the space race, NASA decided upon a radical and risky change of plan: turn Apollo 8 from an earth-orbit mission into a daring sprint to the moon while relying on untried new technologies. Fifty years after the historic mission, the Apollo 8 astronauts and engineers recount the feats of engineering that paved the way to the moon.

Jupiter's gravitational force made it a wrecking ball as it barreled through the early solar system, but it also helped shape life on Earth as it brought comets laden with water and possibly the asteroid that put an end to the dinosaurs.

Nasa's Cassini reveals the mysteries of Saturn's rings and new hope for life on one of its moons.

Uranus and Neptune's unexpected rings, supersonic winds and dozens of moons; an up-close view of Pluto before exploring the Kuiper belt.