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Elinor learns that the forest does its own composting; Elinor and her friends want to build snow-friends, but the snow isn't sticky enough.

Junior is jealous of the attention baby Gio gets so he starts acting like a baby; Alma's playing keeps little Lilly awake.

Grandpa Nat joins the kids on a night watch to determine what the mysterious light is in the sky; Molly and Tooey help Mr. Patak record a carving demonstration.

Xavier and Yadina overcome a sibling spat with the help of Confucius; Sacagawea helps Xavier and Brad realize that just because Yadina is younger, she can do more than they think.

Abby, Big Bird and Cookie Monster play against Gabrielle, Zoe and Elmo in I Wonder If We Can Use This, a game where they figure out if items can be used for something.

Daniel isn't feeling well and is forced to miss Prince Wednesday's birthday party; Dad and Daniel help out when Mom Tiger gets sick.

A 1908 "Anne of Green Gables" first edition; Rudolph & Santa puppets; a Lyonel Feininger art collection.

Ron embarks on an adventure to reach a sailboat using a military landing craft as he races against a violent prairie storm in Lake Diefenbaker, Saskatchewan.

A Tanzanian adventure spanning Arusha, Tarangire, Serengeti and Ngorongoro National Parks; a Maasai village and school; Lake Manyara and Olduvai Gorge.

From jet skiers to herpetologists, manatees to snapping turtles, the wild Suwannee River inspires a whole range of passions.

Exploring Scandinavia's wild and unpredictable coast, beginning around the Swedish Baltic Sea which includes fjords home to eagles, otters, base jumpers and orcas.

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

Nebraska football highlights and analysis.

Following New York's transformation in the decades since the terrorist attacks on Sept. 11, 2001, as the city rebuilds through financial collapse, Superstorm Sandy and a pandemic.

Nebraska football highlights and analysis.

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

Following New York's transformation in the decades since the terrorist attacks on Sept. 11, 2001, as the city rebuilds through financial collapse, Superstorm Sandy and a pandemic.

Five choreographers create world premieres for The Joffrey Ballet's Winning Works.

Tommy and Kevin start to lay subfloor in the dining room; Charlie explains drilling granite for the new garage and driveway; Kevin tours Cape Ann then joins Tommy to move an interior doorway.

Finds include an 1895 UNC football, an 1856 Chinese export Canton fire oil painting and a Jacob Hurd silver cann circa 1745.

Buster believes that a comet is heading straight for Earth; Arthur learns about a different culture when a Spanish family moves in.

Olive and Otto try to stop Obfusco's plant from taking over headquarters; Otto gets trapped inside a video game.

Martin and Chris try to replicate the actions of a water-walking basilisk lizard.

The Hunters search for a way to monitor the weather after they lose power during a thunderstorm.

Lyla overcomes her fear of rock-climbing; a riddle game about everyday objects made by Black inventors.

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

Katerina and Daniel have so much fun at the Treehouse, they don't want to leave when it is time to go home; Daniel needs to work on his school project, but he doesn't want to stop playing.

Phoebe plans a birthday surprise for Grandma; Phoebe and Jay must tend to the bell pepper in the garden.

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

The Wombats build a Cause and Effect machine; Super's best friend Chanaa pays a visit.

Donkey makes Grampy a special card, but she gets into a few sticky situations when she tries to deliver it to him; the pals help Harriett with her new invention for penguins.

It's Recycling Day, so Rosie becomes a recycling kid, but she accidentally recycles Crystal's art project; when Rosie and Javi find a monarch butterfly in the backyard, they try to figure out what it needs so it can flutter again.

The kids learn the meaning of stories when they visit Olive's family in the rainforest.

Alma accidentally embarrasses Rafia during a sleepover at the community center; Alma and her friends jump in the leaves.

Trini wants to send her mom a care package, but she is unable to find all of her favorite things; Trini and her dad find themselves without lights and heat during a blizzard.

William Shakespeare shows Brad that it is alright to feel how he is feeling; Katherine Johnson encourages Yadina to be proud of her love for turtles.

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

Katerina and Daniel have so much fun at the Treehouse, they don't want to leave when it is time to go home; Daniel needs to work on his school project, but he doesn't want to stop playing.

An Elvis Presley outfit circa 1970; a 1942 Grandma Moses painting; C.F. Martin & Co. guitars.

The team has three days to dig through a 6,000-square-foot home full of artwork, artifacts and mementos, to find a woman's most prized items and find a place to put them.

Touring three of London's palaces -- the Tower of London, Hampton Court and Kensington Palace; host Lucy Worsley.

Problems plague Jean and Lionel (Judi Dench, Geoffrey Palmer) as talks with the studio about their love story continue.

Hyacinth and Richard pay a visit to a travel agent so Mrs. Bucket can "one-up" Delia Wheelwright.

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

A flood brings new challenges for the big cats; for the first time, the lion cubs experience water and the danger it brings.

How cultural traditions have led to remarkable innovations, from navigating the featureless Arctic to building energy-efficient homes in the desert.

Exploring the importance of the polar seas as polar oceans warm and sea ice disappears.

How cultural traditions have led to remarkable innovations, from navigating the featureless Arctic to building energy-efficient homes in the desert.

Exploring the importance of the polar seas as polar oceans warm and sea ice disappears.

Five choreographers create world premieres for The Joffrey Ballet's Winning Works.

Tommy and Charlie create a cathedral ceiling; Mark breaks through the foundation to make space for mechanicals; Kevin learns about sun tunnels, and Richard creates a plan for cooling.

The family stories of political organizer Donna Brazile, actor Ty Burrell and artist Kara Walker.

Arthur and his friends enter a poetry contest; Arthur takes on a group that wants to pull his favorite books from the library.

Oz arrives from The Movie Star dimension to help Orli find out who is turning the townspeople purple; three young villains cause trouble in town.

On their annual laundry day, the Kratt brothers disagree on whether blue oceans or green forests are better; Aviva demonstrates how oceans and forests work together.

Dot and Al announce the Hunters are spending Christmas in Nigeria, and Corky wonders if she can have a fun Christmas without snow.

Lyla, Luke and Everett look for buried car keys at the beach; Lyla and Everett write a Super Stu comic.

Carl tries to add other colored karate belts to his collection without having to practice and earn them himself; Carl's upset when his cucumber seeds don't sprout.

The children put on a show at school, each doing something that makes them special; Dad reminds Daniel of the things that make him special.

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

Elmo, Grover, and all their friends help Charlie build a Little Library for her Mitzvah Day project for her synagogue. Helping neighbors share books is Charlie's way of making the world a kinder place.

Mr. E has a lot of ping-pong balls and the survey says that he should sell the purple ones; Super's lost her glasses and the Lost and Found Patrol try to find them.

Panda helps Donkey prepare for her first eye exam; Donkey cheers herself on in the Music Marathon.

Rosie wants to be Mayor for the day; Rosie decides she wants to be a statue.

The Exploring Club discovers that there is an entire community of critters living under logs; Elinor, Ari and Olive learn how rain is helpful to plants and animals.

Alma wants to borrow a new book from the library, but so do all her friends; Alma borrows a ukulele from the library but doesn't want to return it.

Trini decides to plan a Juneteenth celebration with Molly and Tooey; Molly and Tooey launch an investigation when items mysteriously disappear from the Trading Post.

Albert Einstein encourages Xavier to ask questions when he is curious about something; Carol Burnett helps Yadina overcome her fear of looking silly by explaining that sometimes it is good to laugh at yourself.

Elmo, Grover, and all their friends help Charlie build a Little Library for her Mitzvah Day project for her synagogue. Helping neighbors share books is Charlie's way of making the world a kinder place.

The children put on a show at school, each doing something that makes them special; Dad reminds Daniel of the things that make him special.

A Philip Margetts archive; Patek Philippe ladies' watches; Japanese silk needlework circa 1910.

A springtime landscape oil painting features redbuds punctuating the greenery of a Shenandoah Valley mountainside.

A hike along a winding dirt road leads to a weathered old farmhouse.

Actors Derek Fowlds and Bill Simons ("Heartbeat") set off from Helmsley, North Yorkshire, and patrol the county before concluding with an auction in Ilkley, West Yorkshire; Phil Serrell and Kate Bliss are on hand to assist.

Investigating the unexpected intersection between art and the sciences, spanning technology, engineering, biology, math and the climate emergency.

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

Some historians estimate that the breaking of Germany's Enigma Code at Bletchley Park shortened the duration of World War II by two years and may have saved 14 million lives; narrator Keith Morrison.

Nebraska football highlights and analysis.

The changing role of police work in Nebraska's small towns and rural areas sees officers now having to train for everything from school shootings to encounters with drug smugglers.

The house in Newton is nearly finished; Kevin finds Tommy and Charlie installing a final detail on the stove; Roger uses flowers, shrubs, and fruit trees to highlight the yard; Liz and Joe pick a countertop.

News. Reporting on the day's international news from London and from BBC correspondents around the world.

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