Astronomers and astrophysicists discuss a supermassive black hole that has been discovered in the Milky Way galaxy.

On the 400th anniversary of Jamestown, science is revealing the truth behind the myth, a saga of adventure, greed, and savagery. Archaeologists have discovered the site of Chief Powhatan's capital, the spot where John Smith met him and his daughter.

Traces the history of the Medal of Honor from its inception during the Civil War through the Iraq War. Focuses on the stories of a valiant few: Sgt. Paul Smith who died protecting his company at the Baghdad Airport; a Holocaust survivor who single-handedly defends a hill during the Korean War; a Navy SEAL, a veteran of the Vietnam War, who swam for two hours in the ocean, carrying his wounded comrades to safety; a Marine at Iwo Jima who used a flamethrower...

Mountaineers and scientists explore Antarctica and climb the continent's highest peak, the Vinson Massif. The present-day expedition is interwoven with a look back at the race between Scott and Amundsen to reach the South Pole in 1912.

A new look at the tragedy that took place in 2003 through interviews with astronauts and families of the deceased. Learn what went wrong and why the shuttle program didn't reach the goal for routine and safe space travel.

Takes you on an extraordinary journey to view a spectacle few humans have ever witnessed: The Great Migration. Journey with more than two million animals in their annual 500-mile trek across the Serengeti Plains. Filmed entirely on location in Kenya and Tanzania and features Africa's greatest predators in deadly pursuit of their migrating prey.

This probing and perceptive biography reassesses the remarkable and tragic life of the third Kennedy son, Robert Francis Kennedy. A man who would almost certainly have been president if his violent assassination hadn't intervened. Features extensive interviews with family members, friends, journalists, Washington insiders, and civil rights activists. Profiles the pivotal roles RFK played in the many major events of the 1960's - the Cuban Missile Crisis,...

During the Korean War, Soviet and U.S. jet fighters clashed in the fastest dogfights ever seen. The most advanced planes of their day, the MiG-15 dueled with the F-86 Sabre over MiG Alley, a strip of airspace along the Korean-Chinese border. Over 30 U.S. and British pilots disappeared during combat over MiG Alley, leaving their family members today with painful unanswered questions. Traces the efforts of U.S. government investigators, forensic experts,...

Looks back at the events of 9/11 and reviews the major investigations into the causes of the collapse of the World Trade Center. Compares the collapse of the Twin Towers with the destruction of the Alfred P. Murrah building in Oklahoma City. Discusses the structural features and fireproofing methods that made these buildings vulnerable and the costs, practicality, and possibility of completely correcting these weaknesses. Features two new buildings...

In a classic science detective story, Nova pieces together the clues about this great catastrophe and probes questions raised about human evolution and Earth's fragile ecosystems.