The hippopotamus has long been an enigma: an aquatic mammal that cannot swim, a vegetarian that is also the most dangerous animal in Africa. All hippos are utterly dependent on water,but in Botswana, hippos face an unparalleled challenge as deep floodwaters dry to dust in a matter of months. The documentary goes beneath the surface to show how hippos protect their families and face their enemies, revealing an animal that is highly sensitive and surprisingly...

Mighty, elemental forces, fiery eruptions, titanic floods, the grinding of great ice sheets, and massive impacts from space molded North America. This spectacular road trip through our nation's tumultuous past sets out to answer three fundamental questions: How was the continent built? How did life evolve here? And how has its spectacular landscape shaped human lives and destinies?

The life of the greater sage-grouse, which lives on the "sagebrush sea" that stretches across 11 states in the American West, is detailed. Other featured creatures include the golden eagle, great-horned owl, cavity-nesting bluebirds and American kestrel.

Shows how human desires are an essential, intricate part of natural history. The program will explore the natural history of four plants -the apple, the tulip, marijuana, and the potato - and the corresponding human desires - sweetness, beauty, intoxication and control. This two-hour documentary begins in Michael Pollan's garden, and roams the world, from the fields of Iowa to the apple forests of Kazakhstan, from a medical marijuana hot house to...

From small towns in the South to remote areas of the Pacific Northwest and Alaska, four eccentric but passionate Bigfoot enthusiasts embark on one single-minded mission: to find the elusive 'creature' known as Bigfoot.

During World War I, the Allies and Germans repeatedly struggled to break the hideous stalemate of trench warfare. In the winter of 1916, Allied engineers devised a massive surprise attack on the German army. NOVA follows bomb disposal experts as they clear topsoil packed with shrapnel and unexploded shells and probe one tunnel system connected to what is probably the world2s largest unexploded bomb.

Rick explores "the most surprising and fascinating land he's ever visited:" Iran. This travel show host visits splendid monuments of Iran's past, explores the 20th century history of this nation, and encounters Iranian people and customs in everyday life. Visits contrast old and new as he visits the cities, villages, and tourist sites of Tehran, Abyaneh, Esfahan, Shiraz, and Persepolis. The one hour special is supplemented with special features assessing...

It offers three whirlwind tours of America's architectural treasures: the ten homes, ten parks, and ten towns that changed our country. Explore American houses through the ages, enjoy a lively history of landscape architecture and our most beloved parks, and discover the story of how we have planned our cities over time.

Inside the rise of ISIS in Afghanistan and how they're training the next generation of jihadists.

The program examines the Latino experience during a war that placed its heaviest burden on working class youth and their communities. Framing the documentary are memoirs of two siblings, Everett and Delia Alvarez, who stood on opposite sides of the Vietnam War, one as a POW and the other protesting at home. During the war, Latinos began asking for the first time: What is the true cost of war and the appropriate price of citizenship?