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Molly's camera breaks while she and Grandpa Nat are observing an active volcano; Molly and Tooey plan a bird-watching trip to celebrate winter solstice and Trini's birthday.

Michelangelo shows Brad that doing something well takes time; Dorothy Levitt explains that it's important to start with the basics when learning a new skill.

Tamir is disappointed when Grandma Nell shows off the drawing he made for Chris before it is finished.

Daniel wants to go outside and play in the snow, but Dad Tiger says he must wait in bed until it is time to get up; Daniel wants to swing as high as Jodi at the playground.

An Elizabeth Peyton portrait oil circa 1987; a 2004 Tony Soprano tracksuit and script; a Corvette Stingray signed by Paul Newman.

Exploring Norway north of the Arctic Circle; a fjord named after a troll; how the tradition of ice sculpting is carried on in an Arctic hotel.

The hidden gems of Charleston; how global warming could lead to longer commutes; a behind-the-scenes look at the process of de-icing planes.

The design, construction and cultural impact of the Washington National Cathedral's "third great eye" -- the nearly 30 foot diameter stained-glass West Rose window.

The journey of self-taught artist James Michalopoulos, from his life as a New Orleans street artist to his streetscapes and record-breaking Jazz Fest posters.

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

Exploring the night sky with photographer Travis Novitsky as seen from Voyageurs National Park, the Boundary Waters Canoe Area Wilderness and Quetico Provincial Park -- areas that together comprise the world's largest designated Dark Sky sanctuary.

Singer-songwriter Barry Manilow performs fan favorites including "Somewhere in the Night," "Mandy," "Copacabana," "Daybreak" and "I Write the Songs.".

Dr. Daniel Amen maps the brain networks that drive physical and emotional pain and reveals his practical, brain-based strategies that help you feel better, think clearer and live more fully.

Celtic Woman celebrates 20 years at The Helix in Dublin with special performances by founding members Chloë Agnew, Lisa Kelly, Méav Ní Mhaolchatha and Máiréad Nesbitt.

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.

Behind the scenes with the cast and crew of "Grantchester" to explore how the series became a hit; featuring archival clips spanning 10 seasons and exclusive interviews.

Muffy sets out to find her long-lost imaginary friend; Francine is not invited to Catherine's 16th birthday party.

A new villain challenges the Mobile Unit; Odd Squad's tube system mysteriously shuts down.

The Kratt brothers want to fly with the peregrine falcon.

A foggy Halloween almost derails Corky and Lily's trick-or-treating.

Lyla and her siblings come up with a sandwich special for Loops Lunch; Lyla helps her mom build a vertical garden behind Loops Lunch.

Carl surprises Sheldon with a lemonade stand, but is confused when Sheldon runs off; Carl's caterpillars turn into butterflies.

Daniel and his family explore nature, watching a red bird build a nest; Daniel, O the Owl and Uncle X take a nature walk through the forest.

Phoebe and Jay use a checklist to guide them through their tasks; Jay creates his first comic book and learns about the importance of page order.

Cinderella needs to tell time for the ball, but her clock is broken, so Nina, Abby and Rudy wonder what tool they can use to fix it.

The Wombats go on a quest to figure out all the elements that go into creating the perfect personal time routine; Zadie wants to make a really loud noise.

The pals each feel differently about a loud thunderstorm; Mama Panda teaches Donkey and Panda new hoop tricks.

Rosie volunteers to put Iggy to bed, but she has to follow his special routine; Rosie assists Crystal in her magic show.

Elinor is the new Clean Captain at school and takes things too far; Ari has a loose tooth.

Alma tells on Emi when she's doing something dangerous; Alma's friends won't try Aaron and Lucas' snacks.

Trini is determined to learn an ice skating move; Tooey and his brothers use tracking skills to find their dad in the forest.

Kofi Annan shows Yadina and Brad that finding a compromise can help everyone; William and Caroline Herschel show Xavier that by including Yadina in his magic show, it can make it even more fun.

Cinderella needs to tell time for the ball, but her clock is broken, so Nina, Abby and Rudy wonder what tool they can use to fix it.

Daniel and his family explore nature, watching a red bird build a nest; Daniel, O the Owl and Uncle X take a nature walk through the forest.

A 1953 D'Angelico guitar; a couture ball gown circa 1885; Larry Bird game-worn sneakers.

The home cooks put their own spins on a fellow competitor's recipe; the cooks present dishes inspired by a friend.

Rick Steves cruises the Seine, visits Sainte-Chapelle and takes a vibrant tour through Paris; the Louvre Museum; Palaces of Versailles; climbing the Eiffel Tower.

Lionel is nervous about the photo shoot for the cover of his new book.

Everyone is in shock when an eccentric woman moves into Daddy's bedroom, claiming to be his fiancée and the sisters' stepmother-to-be, and it's up to Hyacinth to break up the insane engagement and get rid of the woman for good.

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

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

Guitarist Joe Bonamassa plays a tribute concert in honor of Rory Gallagher in Rory's hometown of Cork, Ireland.

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.

Exploring the night sky with photographer Travis Novitsky as seen from Voyageurs National Park, the Boundary Waters Canoe Area Wilderness and Quetico Provincial Park -- areas that together comprise the world's largest designated Dark Sky sanctuary.

Visual interpretations of classical music set to images of nature, fantasy, historical locations, architecture and art; host Barry Bostwick.

Francine is upset she does not receive the Athlete of the Year Award; guest Michelle Kwan; Arthur gets a new babysitter.

Orli has taken on too many things at once, in addition to helping Orwell keep HQ running; The Oddness Monster needs to be watched.

As the team prepares for a creature costume party, everyone starts to notice strange things happening around them.

Benny's toy penguin is swept away by melting snow, transforming a day of sledding into an urgent rescue mission.

Liana accidentally submits art that Stu made and feels guilty taking the credit for his work; Lyla and Luke perform an "Anansi" folktale puppet show.

Carl gets a universal screwdriver for his birthday; a storm creates a hole in the walkway to Carl's house.

Even though Mom Tiger is working, Daniel wants her to play with him.

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

On a hot day, Abby creates a snowman to keep her and Elmo cool; when they return from finding decorations, their snowman has vanished.

The Wombats program the "Toy Maker" when Mr. E's shipment is delayed; the Wombats track down a ruckus, discovering many noises along the way.

Donkey is nervous the first time she sleeps outside; Panda forgets his poetry notebook inside Donkey's messy windmill.

Iggy wants to see the garbage truck, but Rosie doesn't know how to get it to come to their house; Rosie attempts to bring nature inside.

Elinor and her friends volunteer to help Mr. Raccoon put up a sign for his bakery, but the sign keeps blowing away; it's Plant Day at school and when Elinor gets a cactus, she's a little disappointed at first.

Alma and Uncle Nestor get separated from the rest of the family on the subway; Alma and Junior are excited about their new neighbors.

Molly and Tooey decide to make a few of their own Alaska Native superheroes; Molly wants to fix up her old sled for Trini, but she's not sure she is ready to part with it.

Brad learns that asking questions can help him feel less afraid; overcoming a challenge makes Yadina feel proud.

On a hot day, Abby creates a snowman to keep her and Elmo cool; when they return from finding decorations, their snowman has vanished.

Even though Mom Tiger is working, Daniel wants her to play with him.

A 1941 Rolls-Royce Wraith center caps and certificate; 1934 All-American basketball team autographs; a Maynard Dixon oil painting circa 1913.

The sun sets over a deserted beach.

A mountain scene with fir tree accents.

Actors Christopher Timothy and Patrick Robinson make their way around Gloucestershire and Herefordshire; Christopher proves to be a worthy student and Patrick shows who's boss when he picks up an eclectic mix of goodies for the auction.

Craft artists; objects and traditions of various holidays; dancers and float builders of San Francisco's Chinese New Year Parade; ceramic artists; Kwanzaa celebrations; and Yoshiko Yamamoto's woodblock Christmas cards.

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

Panel of experts answer lawn & garden questions.

Celebrating the three amateur sleuths who use their unconventional methods to solve a series of murders.

A behind the scenes look at "The American Revolution" with Ken Burns, Sarah Botstein and David Schmidt to learn about the production, which took nearly a decade to complete.