Public Broadcasting Service (U.S.)

NOVA's expert team looks for the signature of a volcanic eruption big enough to have blasted a huge cloud of ash and sulfuric acid into the atmosphere. Killer Volcanoes spotlights the search for the mystery volcano that plunged the globe into a deep freeze and inflicted famine on medieval Europe.

The Iran hostage crisis involved 52 American diplomats, Marines, and civilians held by force at the American Embassy in Tehran on November 4, 1979. Unfolding like a political thriller, see how hostages' personal lives were torn apart and scrutinized through publicity, correspondents risked their lives to discover the truth about Iran, and military forces attempted to rescue the victims.

Creature teachers Chris and Martin Kratt will take families along on extraordinary animal-powered adventures. The show transforms the Kratt Brothers into animated versions of themselves, allowing the real-life zoologists to visit wild animals in their little-seen habitats and showcase key science concepts.

A documentary film that focuses on the Confederate Battle flag and its impact on the people, politics, and perceptions of South Carolina and beyond. Through firsthand interviews featuring various perspectives and a wealth of historical footage, Downing of a Flag traces the symbol's controversial relationship with the Palmetto State, exploring its true meaning and how an unspeakable tragedy catalyzed its long-debated removal. The story begins with...

For two years, special counsel Robert Mueller's probe into Russian meddling in the 2016 election dominated news headlines and rocked Washington D.C. Drawing on in-depth interviews with senior law enforcement officials, Trump insiders, attorneys, authors and journalists, FRONTLINE offers an inside look into the investigation that President Donald Trump has continually deemed a 'witch hunt.'

Using instructions from an intriguing, 3,700 year-old inscription, a team of historians and expert boat builders investigates a fascinating flood legend and sets out to rebuild a tantalizing, ancient forerunner of the Ark.

"More than three decades after the Clean Water Act, two iconic waterways -- the great coastal estuaries of Puget Sound and the Chesapeake Bay -- are in perilous condition. With polluted runoff still flowing in from industry, agriculture and massive suburban development, scientists fear contamination to the food chain and drinking water for millions of people. A growing list of endangered species also is threatened in both estuaries. [This film] examines...

"In the early 1830s Texas was about to explode. Although under Mexican rule, the region was home to more than 20,000 U.S. settlers agitated by what they saw as restrictive Mexican policies. Mexican officials, concerned with illegal trading and immigration in Texas, were prepared to fight hard to keep the province under their control. Caught in the middle were the area's 4,000 Mexican Texans or Tejanos who were forced to choose a side. The conflict...

Instructor leads participants through easy yoga poses for upper and lower body while seated, standing poses for hips and legs with the aid of a chair (if needed), and relaxation and meditation.

Based on the Nobel Prize-winning novels by John Galsworthy, The saga is an epic and highly praised series spanning three generations of the powerful Forsyte family at the turn of the 20th century. Beneath the family's imposing veneer lies a festering core of unhappy and brutal relationships.