The film explores why the famous tower of Pisa hasn't fallen over yet and investigates the many efforts taken to preserve this medieval treasure.

Is time travel anything more than sci-fi fantasy? Many leading physicists now believe that time travel is not only possible in theory but are discussing how to build a time machine. Physicist Kip Thorne tells NOVA how humankind's infinitely advanced descendants might go about achieving it with "quantum wormholes" and some "exotic matter". Demonstrating that faster-than-light travel may be possible, German physicist Guenter Nimtz claims to have transmitted Mozart's 40th Symphony across his lab at 4.7 times the speed of light. Impossible, yes, but recorded by NOVA's cameras and perhaps another step on the road to reaching the future or the past. The truth about time travel is wrapped up in the detail of how our universe works and how it all began. Mind-boggling as these perspectives are, NOVA dramatizes them in a playful and visually dazzling style that will captivate viewers and sweep them along on the ultimate thrill ride.

The passing of Marilyn Sheppard in 1954 is one of the most famous unsolved cuddles in America. The indictment of her husband, Dr. Sam Sheppard, quickly became the "Trial of the Century", then the "Re-Trial of the Century", making a celebrity out of lawyer F. Lee Bailey. Although most of the forensic evidence gathered in 1954 was ignored during Sheppard's trial, it is being re-examined with today's advanced technology. Like an intricate puzzle, the clues come together to overturn previous assumptions about the hugger and point to an entirely new suspect. NOVA assembles a notable team of experts-including Barry Scheck, a well-known lawyer from the O.J. Simpson trial-and builds a precise replica of the Sheppard house, complete with the original furniture. With this unique revisiting of a vanished crime scene, NOVA investigates a horrifying and sensational milestone in forensic science.

In the far north of Japan, thrust out into the north Pacific, is the remote island of Hokkaido. It's a land of towering volcanoes and steaming lakes, marshy valleys and fairy tale forests. Among this magical scenery, where summers are brief and winters are fierce, lives an extraordinary spectrum of life, found nowhere else in Japan. Here among the coastal lowlands, grizzly bears plunge into icy streams for salmon, Japanese cranes perform balletic courtship dances to one another, the rare and enormous Blakistons fish owl swoops on flying squirrels, and white-tailed eagles scan the rugged ocean cliffs for unsuspecting seabirds. HIgh on the mountains Asiatic pikas, arctic hares and Siberian chipmunks gather food, ever-watchful for the predatory sable. We think of Japan as a highly-populated, ultra modern society, and yet it remains a highly spiritual place where wildlife is treasured and carefully protected. Weaving Ainu legend with fascinating natural behavior, this film will follow the lives of Hokkaido's special creatures through the seasons, to capture the true essence and beauty of this other-worldly place.

Most historians agree that by enabling Allied commanders to eavesdrop on German plans, Station X shortened the war by 2 or 3 years. Its decoded messages played a vital role in defeating the U-boat menace, cutting off Rommel's supplies in North Africa, and launching the D-Day landings. Now, for the first time on television, a 2-hour NOVA Special tells the full story of Station X, drawing on vivid interviews with many of the colorful geniuses and eccentrics who attacked the Enigma. Wartime survivors recall such vivid episodes as the British capture of the German submarine U-110; one of its officers describes how he saved a book of love poems inscribed to his sweetheart but failed to destroy vital Enigma documents on board. "Decoding Nazi Secrets" also features meticulous period reenactments shot inside the original buildings at Station X, including recreations of the world's first computing devices that aided codebreakers with their breakthroughs. Station X not only helped reverse the onslaught of the Third Reich, but also laid the groundwork for the invention of the digital computer that continues to transform all our lives.

Buried in mud beneath the shallow waters of Matagorda Bay in Texas, lay a glorious remnant of one of the most ill-fated voyages of the Age of Discovery. After years of searching the area, nautical archaeologists doing a magnetometer survey honed in on a promising site. And on the first day of diving, they were astounded to feel the distinctive outlines of a cannon, and sense the massive size of the wreck. When the cannon was hauled from the water, their hunch was confirmed: This ship, called La Belle, belonged to the 17th Century French explorer Robert Cavelier de La Salle. NOVA follows the building of a coffer dam and subsequent complete excavation of this remarkable site. Preserved were not only armaments and trade beads, but also a wealth of organic material-the wooden hull, leather shoes, and even a skeleton-that brings the voyage to life.

The program tells the story of a handful of brilliant, obsessed surgeons and researchers who have pursued the target of a practical artificial heart for decades.

In this NOVA program, our cinematographer literally filmed inside a hive and followed bees in flight to capture closeups of honeybee behavior.

The program chronicles a successful 1999 NOVA expedition to investigate the mysterious disappearance of George Mallory and Andrew Irvine high on Everest in 1924. During this expedition, which included a NOVA/PBS Online Adventure, Mallory's body was found, though the mystery only deepened.

In the film, which is a part of the NOVA series Secrets of Lost Empires, a team of timber framers and other specialists design, build, and fire a pair of trebuchets, a devastating engine of war popular in the Middle Ages.

The film documents the efforts of researchers around the world to create synthetic diamonds, some of which have become so indistinguishable from natural diamonds as to fool experts.

In the film, which is a part of the NOVA series Secrets of Lost Empires, NOVA brings together a team of Egyptologists, engineers, stonemasons, and timber framers to probe the mystery of how the ancients shaped, transported, and erected their elegant obelisks.

The film tells the fascinating story of the invention of the Black-Scholes Formula, a mathematical Holy Grail that forever altered the world of finance and earned its creators the 1997 Nobel Prize in Economics.

The film, which is a part of the NOVA series Secrets of Lost Empires, showcases the efforts of a team of archeologists, engineers, and other experts to transport an Easter Island moai, or carved stone monolith, overland and successfully raise it onto a pedestal.

In 1996, near Kennewick, Washington, a suspected cuddle victim is identified by forensic anthropologists as Caucasian - but turns out to be almost 10,000 years old. For fifty years our picture of prehistoric America has rested on the premise that the earliest inhabitants of the Americas were east Asians of mongoloid stock, the ancestors of today's Native Americans. But the discovery of the Kennewick Man, along with several other startling finds in recent years, has thrown that once widely accepted idea into question and revolutionized the science of paleo-anthropology. It has also embroiled scientists in a bitter conflict with Native American groups who want the scientific study of early Americans halted. Who and what do Kennewick Man and others represent? NOVA is following the efforts of paleo-anthropologists work to decode the story in the bones of people who died 10,000 years ago.

In the film, which is a part of the NOVA series Secrets of Lost Empires, an international crew of archeologists, engineers, and historians designs, builds, and tests a functioning Roman bath in the Turkish countryside.

At the heart of Jewish tradition lies the haunting mystery of the Lost Tribes of Israel. Ever since their defeat and banishment by the Assyrians in 722 BC., the Lost Tribes fate has inspired countless claims to Jewish ancestry by groups scattered on every continent. But now, surprisingly, new advances in genetics are dispelling myth and fantasy, and raising a curtain on the forgotten reality of the dispersal that happened so many centuries ago. This story will follow the first attempt to use the new tests to investigate a seemingly improbable African candidate for a Lost Tribe. It will dramatize a scientific quest that leads from the gene labs of London to the remote bush country of Zimbabwe and the lunar-like desert wilderness of southern Yemen.

The film, which is a part of the NOVA series Secrets of Lost Empires, documents a 1999 effort by a NOVA-assembled crew of scholars and timber framers to design and build a Chinese bridge known only from an ancient painting.

In "What's Up with the Weather- NOVA and FRONTLINE join forces to investigate the science and politics of one of the most controversial issues of the 21st century: the truth about global warming.

The broadcast explores America's manned space program and the crisis caused by Russia's delay in delivering the critical third piece of the International Space Station.

In this two-hour special, NOVA presents a dramatic investigation of a people who were much more than axe-wielding pirates. It features stunning camerawork in Scandinavia and the far-flung countries that the Vikings penetrated, while historians and archaeologists present us with an image of the Vikings that goes far deeper than their savage stereotype. The latest research shows that they were canny merchants, expert shipbuilders, superb artisans, and bold colonizers of lands that lay beyond the edge of the known world.