Astrophysicist and novelist Janna Levin talks about black holes and their importance to the universe.

3,600-year-old reliefs in Egyptian tombs and temples depict pharaohs and warriors proudly riding into battle on horse-drawn chariots. Some historians claim that the chariot launched a technological and strategic revolution, and was the secret weapon behind Egypt's greatest era of conquest known as the New Kingdom. But was the Egyptian chariot really a revolutionary design? How decisive a role did it play in the bloody battles of the ancient world? In "Building Pharaoh's Chariot," a team of archaeologists, engineers, woodworkers, and horse trainers join forces to build and test two highly accurate replicas of Egyptian royal chariots. They discover astonishingly advanced features, including spoked wheels, springs, shock absorbers, anti-roll bars, and even a convex-shaped rear mirror, leading one of them to compare the level of design to the engineering standards of 1930's-era Buicks! By driving our pair of replicas to their limits in the desert outside Cairo, NOVA's experts test the claim that the chariot marks a crucial turning point in ancient military history.

Hidden in the red hills of western Australia are clues to the mysteries of when the Earth was born, how life first arose, and how it transformed the planet.

How did life storm the beaches and dominate planet Earth? Ancient Australian fossils offer clues in "Life Explodes." Half a billion years ago, Australia was still part of the super-continent Gondwana. The oceans were teeming with weird and wonderful animals, but the world above the waves remained an almost lifeless wasteland. All that was about to change, though. Host Richard Smith introduces Earth's forgotten pioneers: the scuttling arthropod armies that invaded the shores and the waves of green revolutionaries whose battle for the light pushed plant life across the face of a barren continent. Evolution continued underwater as well, with armor-plated fish experimenting with teeth, jaws, sex, and lungs. NOVA's prehistoric adventure continues with four-legged animals walking onto dry land—and the planet poised for disaster.

"Monsters" begins Down Under at the dawn of the Age of Dinosaurs. Host Richard Smith comes face-to-face with the previously unknown reptilian rulers of prehistoric Australia. NOVA resurrects the giants that stalked the Great Southern Land and discovers that some of these animals were among the largest ever to have walked the Earth. Others were some of the most dangerous. In the dry desert heart, scientists unearth an ancient inland ocean full of sea monsters. Opal fossils of some of these beasts paint a colorful picture of the exotic seascape, where long-necked plesiosaurs snacked on shelled creatures that grew as large as truck tires. The most fearsome was Kronosaurus, with a skull twice as long as T. rex. But reptiles didn't have the world all to themselves. Mammals like the enigmatic platypus lived alongside them, ready for their moment in the sun.

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?")

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.

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.

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.

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.

Part one of a two-part series on the subject of man in space, NOVA examines the history of NASA—from the origin of the space race through the triumph of the Apollo programs. By tracing the history of three key programs—Mercury, Gemini, Apollo—we show how the basic challenges surrounding space flight were answered: rendezvous and docking, life support, weightlessness, space sickness, equipment reliability and so on.

Imagine a bottle with no inside or a number bigger than infinity or parallel lines that meet. Welcome to the world of pure mathematics. NOVA offers a look into a wholly abstract, quirky world of mathematics.

Forty years after they were discovered, the Dead Sea Scrolls have yet to be published in their entirety. NOVA looks at the laborious-some say scandalous-process of compiling and releasing this religious treasure.

With help from director Steven Spielberg, author Michael Crichton and a host of scientific experts , NOVA investigates what it would take to recreate the dinosaur theme park in Jurassic Park. It won't be as easy as it was for Hollywood.