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Actors Kristen Bell and Dax Shepard learn about their family histories, which includes stories of soldiers, settlers and criminals.

Increasing motion in the knees and shoulders.

Strengthening abs and core with standing and floor exercises.

The kids try to get animals to the Flower Garden for its grand opening; the kids try to find out how their snow sculptures got ruined.

Nature Cat and the gang help deliver a possum's letter to his wife in the big city; the crew must stop an evil gerbil from stealing the sunset.

Molly and Tooey think they've discovered a ghost, until they realize it's a bird stuck in a dryer vent; Molly and Trini go with Nina to the Kenai National Park to see the puffins.

Arthur wakes up in a strange part of town when he falls asleep on a bus; summer vacation is ending too quickly for Arthur.

The Mobile Unit, with the help of the Big O and two Australian agents, attempts to stop The Shadow from causing trouble Down Under.

Aviva creates a game in which Martin and Chris learn about predators and prey as well as the differences between herbivores and carnivores.

It's an exciting day for Lily and her family when they move into their new house.

Lyla and Luke clean Stu without a bath; Lyla and Ale find a way to protect the callaloo plants from stink bugs.

Carl blames Nico when his special crayon breaks and Nico blames Carl when his drawing rips; Lotta tries to learn to play the alto saxophone.

While flying a kite, Daniel, Katerina and O learn that it's okay to feel two different feelings; when Daniel arrives at the carnival he feels excited and scared about riding the Ferris wheel.

Phoebe learns what privacy signs are and how to use them to communicate to neighbors; Jay gets nervous about getting a haircut.

Papa Bear wants to teach Baby Bear Tee ball, but Baby Bear would rather prefer to draw the ball than hit it.

The Wombats build a wind chime to help Great Uncle Duper fall asleep; Zeke tries to make Snout out of clay.

While flying a kite, Daniel, Katerina and O learn that it's okay to feel two different feelings; when Daniel arrives at the carnival he feels excited and scared about riding the Ferris wheel.

Arthur wakes up in a strange part of town when he falls asleep on a bus; summer vacation is ending too quickly for Arthur.

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

Planting an indoor garden; the basics of using a hole saw; replacing a common terra-cotta hearth with slate tile.

A 1775 Stephen Easterman-carved powder horn; a Rolex Zenith Patrizzi dial Daytona watch; a 1928-1934 baseball autographs collection.

Actors Kristen Bell and Dax Shepard learn about their family histories, which includes stories of soldiers, settlers and criminals.

Lucy Worsley investigates the 18th century breakup of Britain and America, including the turning points that led to America's Declaration of Independence from Britain in 1776.

Human skeletal remains found in the basement of Ben Franklin's British residence may have been used for science.

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.

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.

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.

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.

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.

Stretching from head to toe by reaching for the sky and breathing properly.

An all-standing workout improves balance, flexibility and mobility.

Elinor and her friends need to find more paper for their storybook; Elinor, Ari and Olive learn about different ways that animals keep themselves clean.

The gang searches for the Leaf Fairy; Nature Cat's waterskiing stunts are interrupted by a swarm of bugs.

Molly and Tooey join Nina and Olin on a cave exploration to find out how old Qyah really is.

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

The Terrible Three break into HQ intent on planning ultimate oddness; the Agents must close the containment units before oddness takes over the whole town.

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

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

Carl's medium-sized fuchsia yo-yo goes missing from his collection; a rainy day changes Carl's pool day plans.

Daniel is afraid he does not look like himself when he wears a blue sweater; Daniel's teacher has a new hairstyle.

Phoebe and Jay are asked to bird sit; photo time leads Jay to an outfit disaster.

Elmo, Abby and Julia build a mini city while Grover helps Cookie Monster serve ice cream.

The Wombats organize the Treeborhood Talent Show; Zeke searches for a collection to call his own for the Treeborhood's Collection Bonanza.

Daniel is afraid he does not look like himself when he wears a blue sweater; Daniel's teacher has a new hairstyle.

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

The cuisine of Lyon, France; Chamonix in France; riding the lift to Aiguille du Midi and to the border of Italy; hiking the Tour du Mont Blanc -- the trail that circles the mountain.

Using a mobile CNC routing machine; building a dog dish stand using power tools; different methods for wiring a portable generator to a house.

Treasures from Omni Mount Washington Resort in Bretton Woods, N.H.

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.

Jack and the team investigate the death of a zoo owner, murdered by a tranquilizer dart.

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.

Jack and the team are puzzled when the presenter of a holiday television program is found drowned, and the spotlight falls on the crew.

A death of a magazine columnist and author of fairy stories.

A prestigious chess tournament turns deadly when old rivalries emerge.

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.

Jack and the team are puzzled when the presenter of a holiday television program is found drowned, and the spotlight falls on the crew.

A death of a magazine columnist and author of fairy stories.

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.