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Prince Tuesday visits the school in his crossing guard uniform and helps the children practice safety rules; Daniel and Katerina drift too far from Mom while playing at the beach.

Phoebe and Jay use Miss Jean's field guide to identify their new butterfly friend; Phoebe gets courage to perform at the talent show.

Cookie Monster uses his new Cookie Cart to bake for his friends; Grover tries magic to entertain his friends.

Zeke is troubled when he goes to the Creation Station for a sleepover and the bedtime routine is nothing like his own; the Wombats navigate a network of tunnels beneath the Treeborhood.

Donkey and Panda camp out to see the Bright Bugs; Panda feels tired of his purple things, so Donkey helps him take a break.

Rosie turns into a Super Kid for her nighttime job; Rosie helps out with the play at the community theater.

Olive's sneeze startles the kids when they are playing in the forest, prompting Elinor to learn about what causes sneezes in the first place; Ari wants to wear his lucky shirt for the big soccer game, but it is much too small for him.

Alma has to learn how to make rules that are fair for everyone when she is elected mayor of Cardboard City; Alma and Junior learn that little acts of kindness make a big difference.

Molly and her family's berry-picking adventure is cut short by pesky mosquitoes; Molly wants to visit her cousin who is harvesting herring eggs.

Grace Hopper shows Xavier that he will never know if he can build his robot differently than everyone else unless he tries; Itzhak Perlman shows Xavier that he can learn music his own way.

America Ferrera and Darren Criss uncover their immigrant roots.

The settlement of the original 13 colonies and how the cultural "Englishness" of those colonies began to change.

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.

Live news program produced out of BBC's Washington, D.C. bureau; host Sumi Somaskanda.

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

The Darjeeling Himalayan Railway is an engineering classic in the lap of the Himalayas, traveling through precarious terrains and five climatic zones.

Anthropologist Niobe Thompson travels the world to uncover how the relationship between humans and horses evolved.

Anthropologist Niobe Thompson travels the world to uncover how the relationship between humans and horses evolved.

Efforts by scientists to control invasive quagga mussels in the Great Lakes which are trapping nutrients on the lake bottom, causing widespread species loss and biological deserts.

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

A celebration of folk musician Woody Guthrie's birthday features performances by Joel Rafael, Roseanne Cash and John Mellencamp.

The Smothers Brothers and Judy Collins host a look at the evolution of modern American folk music; performers include Glenn Yarbrough, the Highwaymen, the Kingston Trio and the Limeliters.

Peggy Cappy presents short exercise breaks that help strengthen and maintain the four pillars that support the body's structure -- strength, flexibility, balance and mobility.

Lyla has to backtrack her hike at Moon Rock Cove to find her mom's missing phone; the Loops kids divide up kitchen cleaning chores between easy and hard, so everyone has an equal amount of work.

A wildcat disrupts a game of badminton.

D.W. must decide is she should speak up when Bud is blamed for something he didn't do; D.W. and Bud want to ride Wonder World's newest roller coaster.

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

Lyla has to backtrack her hike at Moon Rock Cove to find her mom's missing phone; the Loops kids divide up kitchen cleaning chores between easy and hard, so everyone has an equal amount of work.

Nico is tired of being mistaken for her twin sister; Carl is upset when Nico breaks the Lint Dinosaur Monday rules and makes a Lint Monster instead.

Daniel learns the importance of sharing his feelings; Daniel pays attention to how many feelings he experiences in a day.

Jay and Lupe use wayfinding signs to track down Phoebe; Pete and Craig face an epic hoops battle on the courts.

Captain Elmo's solo mission to Jupiter is interrupted when his friends join and mess up his plan; Grover tries to fix the spaceship boosters.

It's Backwards Day in the Treeborhood; Cece, Carly and Clyde have fun with patterns.

Donkey's guitar goes missing just before the talent show; Duck Duck finally finds her family's treasure nest, but she is unable to open it.

Rosie puts on a concert when Tia is unable to get tickets to see her favorite singer; Rosie loses her first tooth, and prepares to welcome both the Tooth Fairy and the Tooth Mouse.

Elinor learns about different plants when she makes soup with her grandparents; Elinor and her friends don't understand why their cupcakes aren't selling.

Alma volunteers André to make necklaces for their friends; Alma, Eddie and Uncle Nestor perform music on the subway.

Molly and Tooey realize drawing is harder than it looks when they help Randall come up with a Northwest Coast design for Aunt Mema and Uncle Jack's anniversary; Molly, Tooey and Trini strike gold.

Hedy Lamarr shows Yadina that she can do more than one thing; Xavier, Yadina and Brad learn that creative thinking can lead to new ideas.

Launch from Gerlach on the Black Rock Desert; art at Planet X; surprise vehicle trouble; climbing Massacre Rim; astrophotography.

California's Mojave Desert is filled with massive blooms of wildflowers in the spring.

David Attenborough explores London's Natural History Museum and meets creatures from the past, brought to life by CGI, including a giant eagle and colossal snake.

With invasive species reshaping the world's ecosystems, Shane wrestles a python, hunts Hawaiian pigs and gets sucker-punched by a carp as he considers how the human species is able to decide what belongs.

A regular panel of guests from across the political spectrum discuss the biggest international stories of the day.

Live news program produced out of BBC's Washington, D.C. bureau; host Sumi Somaskanda.

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

Crossing the harsh terrain of the Australian outback, the Ghan, a luxury train, and its 3,000 km of track need constant and skilled maintenance.

Mrs. Devine and Sullivan's wedding approaches; can Father Brown stop a would-be killer from ruining their big day?

Commissioner Selwyn Patterson is shot at the Yacht Club.

Aaron Tveit, Patrick Wilson and more perform songs from musicals by Rodgers & Hammerstein including "Carousel," "South Pacific," "The King and I" and "The Sound of Music.".

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

Rick Steves explores the German cities of Hamburg, Dresden, Leipzig, Frankfurt and Nuremberg, including their Baroque palaces, skyscrapers, riversides and beer halls.

Celebrating Europe's art and creative geniuses, from Leonardo da Vinci to Vincent van Gogh; Florence's bold "rebirth" after Europe's medieval struggles; impressionist works of the late 1800s.

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.

The team tries to figure out how a gecko lizard climbs up surfaces and upside down.

Lakewood Elementary students must share their school with rival students whose school gets flooded; the gang doesn't know what to do when the internet goes out.

The Hunters investigate a weather mystery surrounding massive rocks that move on their own in the desert.

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.

Lotta is determined to show Skyler that she is more than just "headphone girl"; the new kid in school causes a hullabaloo on the playground.

Daniel teaches his friends his happy song; Daniel is excited to go to the castle for Prince Wednesday's birthday party.

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

Director Grover has the perfect plan for his play; Tamir and Cookie Monster try to fix the suitcase.

The Wombats try to save Harvest Day as it becomes overrun by fog; Zeke tries to create stew that meets Mr. E's high standards.

Donkey and Panda set big goals to achieve throughout the day; Donkey shows Mousy how to play the Donkey Way.

Rosie makes a dance party island in her backyard, but the flag she puts up causes confusion; Rosie decides to be the mascot for Javi's soccer team.

The kids learn the best way to slide down a hill; Ari and his friends learn the importance of oral health after Ari forgets to brush his teeth.

Alma opens a traveling repair service, but running back and forth for fix-it supplies proves exhausting; Alma has to figure out how to handle her feelings when Howard tells Junior he can't play water tag.

Trini's excited to enter her giant cabbage into the Alaska State Fair, but a moose keeps nibbling at its leaves; Molly has to impress Aunt Merna if she wants to get her native name.

Ravi Shankar shows Yadina that it can feel good to share her culture; Babe Didrikson Zaharias shows Yadina that practice can help her do difficult things, like making the basketball team.

Paleontologists discover that dinosaurs thrived in unlikely places such as the cold and dark Arctic Circle.

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

Eric Hanson's perilous Grand Canyon adventure continues after having taken an unexpected and dangerous turn.

Visiting Portland, Ore.'s Oaks Park, the last remaining trolley park on the West Coast, which includes the oldest roller rink in the U.S.

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.

Live news program produced out of BBC's Washington, D.C. bureau; host Sumi Somaskanda.

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

As the nation nears its 250th anniversary, moderator Jeffrey Goldberg leads a panel of prominent journalists in exploring America's future.

America Ferrera and Darren Criss uncover their immigrant roots.

Josh Groban performs many of his beloved songs as well as new material at London's historic Union Chapel.