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A prestigious chess tournament turns deadly when old rivalries emerge.

An 1857 Queen's Cup Ascot race trophy; a 1956 Curta calculator type II; an art deco sapphire and platinum ring.

Maintaining strong lungs and a sharp mind with good breathing techniques.

A full-body relaxation workout that stretches and strengthens feet and calves.

Elinor and her dad learn how to make their own chocolate; after accidentally breaking a jade plant, the kids learn how the plant grows.

The gang goes looking for their Nature Nap hammock; Nature Cat and his pals help an oyster named Elroy get back home.

Molly and Tooey are confused when Trini refuses to join the basketball team because of polar bears; Molly's trip north to surprise Nina for her birthday is jeopardized by a moose blocking the runway.

Muffy learns about her great-great-grandmother; Arthur doubts a decision he makes during a baseball game.

Odd infestations send Ms. O from her office; Ms O. needs help tracking down her old partner.

The brothers are trapped when their submarine loses power.

As a hurricane approaches, the Hunter kids learn about preparation and safety, moving furniture inside and checking their emergency supplies.

Lyla and her family must figure out a way to get Stu back home when he gets lost delivering cookies.

Arugula and Carl go on an adventure as archaeologists; Carl spots a UFO on Mother's Day.

Chrissie encourages Daniel to ride a horse; Margaret gets scared when fireflies crash the family picnic.

Phoebe and Jay learn how to sort items; Phoebe and Jay learn how to make food labels, so everyone can participate in the potluck.

While Abby and Elmo work together to find a lost Bubble Bug, Grover and Cookie Monster stay behind to take care of the fairy garden's magical beasties.

The Wombats lose Snout while helping Mr. E wrap boxes; Snout sends a postcard to Zeke.

Chrissie encourages Daniel to ride a horse; Margaret gets scared when fireflies crash the family picnic.

Muffy learns about her great-great-grandmother; Arthur doubts a decision he makes during a baseball game.

The rise and fall of fascism in Germany; tracing the roots of Nazism after World War I, from Munich to Nuremberg to Berlin; exploring the totalitarian society built by Adolf Hitler.

Jenn visits Washington's Cherry Blossom Festival and plants a tree; Mark learns how Mount Rushmore was built and shows stone cutting; Nathan visits Abe Lincoln's house then replaces mortise hardware.

A Louis C. Tiffany enamel vase circa 1905; a 1599 Thomas Buckminster almanac; Ernie Barnes' Fourth and One oil painting.

The history of unique American horse breeds, including the mustang, Appaloosa, Morgan and quarter horse, that helped shape the nation and the people who continue the tradition of caring for them.

A team of archaeologists researches the "desert kites," the stone megastructures across northern Saudi Arabia and southern Jordan.

Battling for dominion over the river with crocs; catching glimpses of an ultra-rare mangrove snake and an endangered nabarlek wallaby; humpback whale mothers raise their calves in the ocean; false killer whales.

A detailed look into news stories from around the world from the BBC news desk in Washington, D.C.

Coverage from Washington, D.C. and London, with a regular panel of guests from across the political spectrum discussing the biggest stories of the day.

Co-anchors Amna Nawaz and Geoff Bennett and correspondents offer in-depth analysis of current events.

Journalists discuss New York state politics and government.

President George H.W. Bush's role as leader of the first Gulf War, through the final days of his presidency.

A look at the documentary series by Ken Burns that illustrates how the American Revolution came to life.

Twenty-four hours a day, the latest national and international stories as they break.

Christiane Amanpour leads discussions about world issues and interviews with global leaders.

Journalists discuss New York state politics and government.

The history of unique American horse breeds, including the mustang, Appaloosa, Morgan and quarter horse, that helped shape the nation and the people who continue the tradition of caring for them.

A team of archaeologists researches the "desert kites," the stone megastructures across northern Saudi Arabia and southern Jordan.

Battling for dominion over the river with crocs; catching glimpses of an ultra-rare mangrove snake and an endangered nabarlek wallaby; humpback whale mothers raise their calves in the ocean; false killer whales.

Cleansing the nose and sinuses to prevent respiratory ailments.

In Swannanoa, Kevin helps Jim's brother Bill tile a bathroom; father and son roofers JD and Jayden; removing rot and replacing the damaged area of Paula's deck.

Kevin meets with an audiologist to discuss the importance of hearing protection; Richard, Nathan and Heath team up to help a couple age in place by relocating their washer and dryer to the main floor.

Reassuring children about arguments; Mr. McFeely shares wedding memories.

Buster comes home from his world travels; a musical moose sums up Buster's concerns about fitting it.

A little brown bat crash-lands into a plate of Jimmy Z's brownies.

Corky is selected to make a presentation at school during a science day celebration, but humidity jeopardizes her project.

Lyla and Everett struggle to play Hot Cross Buns at the same tempo, and they learn how to read music; Lyla is upset when Luke's snack becomes popular.

Xavier and his friends meet American artists Mark Twain, Maya Angelou, Julia Child, Alvin Ailey, Jerry Siegel and Joe Shuster.

Phoebe and Jay set a new record for the longest paper airplane fight; Phoebe and Jay learn how to build a stable pillow fort.

Pedalling along the less-travelled routes to experience Japan's unexplored beauty, from shorelines and mountains to architectural wonders and more.

In Swannanoa, Kevin helps Jim's brother Bill tile a bathroom; father and son roofers JD and Jayden; removing rot and replacing the damaged area of Paula's deck.

Kevin meets with an audiologist to discuss the importance of hearing protection; Richard, Nathan and Heath team up to help a couple age in place by relocating their washer and dryer to the main floor.

Escargots in baked potatoes; stuffed tomatoes; bread filled with hazelnuts and chocolate; chocolate-pistachio brittle.

Tim Donovan has fond memories of calzones, a stuffed bread that his Italian mother and grandmother made.

Spatchcocked Cornell chicken; barbecued salmon with brown sugar and butter sauce; Baltimore pit beef.

Pompano with crabmeat imperial sauce; steak au poivre; crawfish étouffée.

Making and eating Indian street food, from corn cobs roasting on open fires to fried puffs stuffed with black chickpeas and dipped in mint-cilantro water; roasted and spiced corn; chickpea-potato chaat; spinach chickpea flour fritters.

Tennessee pulled turkey sandwiches; paper towels; a regional recipe for eastern North Carolina fish stew.

Ground beef and cheese enchiladas; six-inch flour tortillas; grilled flank steak tacos.

Winter minestrone; roasted squash and carrot salad with chickpeas and almonds.

An 1857 Queen's Cup Ascot race trophy; a 1956 Curta calculator type II; an art deco sapphire and platinum ring.

Switzerland's mountains and culture; scenic train rides; exploring glaciers; making cheese the old-fashioned way.

The Dwight D. Eisenhower Lock Visitors Center in Massena, N.Y., preserves the story of the St. Lawrence Seaway's legacy and history.

This 30-minute international newscast produced by Japan's national public broadcaster NHK looks at the realities of Asia today. From the diminishing natural coral along the coast of Boracay to the recruitment efforts by The Republic of Korea to find foreign workers to offset its labor shortage and aging population, the documentary series offers in-depth, behind-the-scenes analysis of news and publ

An accident during the restoration of a canal appears to be linked to a group of rowdy teenagers; Troy is promoted.

Rivalry turns deadly when a Cambridge student is murdered and Alphy's Bible is found at the scene; Geordie faces a pivotal decision.

Cora gets into trouble with Hooper; without the help of the police, Cora relies on Jimmi and Katy to unravel the clues.

Colombian musician Juanes performs a career-spanning set that includes songs from "Vida Cotidiana.".

A prestigious chess tournament turns deadly when old rivalries emerge.