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Onsite extraction of fossils of an ichthyosaur, a fish lizard that ruled during the time of the dinosaurs, and a 3-D reconstruction of the creature; host David Attenborough.

Exploring the quantum universe.

With the house recovering from the night's dramatic events, Robert is faced with a very difficult decision; as Daisy continues to struggle with her studies, Mrs Patmore has an idea that might solve everything.

Violet learns about Mary and Tony from Spratt; Mary tells Violet she plans to wed Tony, but admits to Tom that she has no such intention.

Sarah Bunting continues to cause waves above stairs but this time she may have gone too far; on returning to Downton, Thomas is suffering an inexplicable illness, and Baxter suspects there's more to it than he's letting on.

Simon Bricker returns to Downton to discuss the painting with Cora, but this time his flirting may have crossed the line. Branson makes a difficult decision about Sarah Bunting, and Rose encounters a handsome stranger.

A detective inspector is transferred from London to the island of Saint-Marie in the Caribbean.

Elizabeth I's image as a warrior queen, facilitated by myths and secrets about her victory over the Spanish Armada, shaped British national identity for centuries.

Everything comes to a head as Richard and Jim descend on Bayview; the family tries to heal and reconnect; the fallout from Mary's actions continues to reverberate.

When the Titanic goes down, Lord Grantham loses his heirs, and Mary loses her fiance.

A crossword puzzle is found on a murder victim, and the police seek help from crossword queen Cora.

Everything comes to a head as Richard and Jim descend on Bayview; the family tries to heal and reconnect; the fallout from Mary's actions continues to reverberate.

When the Titanic goes down, Lord Grantham loses his heirs, and Mary loses her fiance.

A diamond mysteriously disappears in Paris and the head of security is found dead.

Touring the exhibits and artifacts of the Safe Haven Museum and Education Center in Oswego, N.Y.

Strengthening and toning legs; Bridge and Warrior; asanas to loosen the hips and knees; stretching the thighs and hamstrings.

A standing and barre posture workout.

Elinor, Olive and Ari disagree about the best way to build a couch cushion castle; when Ari misplaces the group's favorite ball, they discover that he needs a system for keeping track of his things.

The crew helps the Bumblebee Queen prepare for growing season; the gang learns the history of an old oak tree.

Molly finds a lost baby beluga and tries to reunite it with its mother; Molly and Grandpa Nat try to retrieve Molly's fishing hat after it floats away.

When Binky's family adopts a baby girl from China, Binky worries about how his life will change and if his new sister will like him.

Olive and Otto are zapped into a comic book.

Martin and Chris uncover a plot by Donita Donata to capture sea horses to make living jewelry.

The Hunters head to a nearby mountain to learn about snow.

Lyla and Ale make an escape-proof container for her pet tarantula; rain keeps the kids inside, so they recreate park activities indoors.

Lotta is frustrated learning a new dance, but realizes it is ok to experience music in her own way; Sheldon worries about telling Carl that he doesn't want to play pirates anymore.

Daniel's rushing to go on a boat ride causes him to break his toy boat.

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

Big Bird is meeting Snuffy at Hooper's for lunch, and everyone decides to surprise him with a Snuffy-sized sandwich named after him, the Snuffwich.

Mr. E learns a dance for Friendship Day; Super, the Wombats and the Boo Boo Blimp to the rescue when the power goes out for the Friendship Daylight Show.

Daniel's rushing to go on a boat ride causes him to break his toy boat.

When Binky's family adopts a baby girl from China, Binky worries about how his life will change and if his new sister will like him.

Rick Steves takes a look at the rich history, art and culture on offer in Amsterdam, Holland's capital.

Richard installs a whole house water filtration system; Tom walks Kevin through various types of woods; Ross visits a hotel room that's powered by voice activation; Jenn Nawada installs a bluestone patio with a reclaimed granite fire pit.

A Cartier Art Deco Tutti Frutti clutch circa 1925; a Carl Kauba cowboy bronze circa 1900; a Sumerian cuneiform tablet.

Touring a new attic apartment ADU in Dorchester, Mass.; plumbing update.

Replacing vintage ceramic toothbrush and soap holders; repairing a water-damaged ceiling crack matching the original swirl texture.

Journalists discuss New York state politics and government.

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.

Finds include a 1961 JFK Santa Claus Letter, a 1979 Ed Ruscha Stage Fright ink on paper and a John Juzek violin circa 1950.

An explosive deep dive into the decades-long quest by America's conservative political machine to amass power by exploiting racial fault lines and stoking narratives of White victimization.

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

Finds include a 1961 JFK Santa Claus Letter, a 1979 Ed Ruscha Stage Fright ink on paper and a John Juzek violin circa 1950.

William Miner's life, the model farm he built, and his legacy of generosity in the North Country.

The Wild Center, a combined zoo-aquarium, museum and education center in the Adirondack Mountains.

Working the entire body through the head and shoulder stands.

A standing and floor workout tones the body and promotes weight loss.

Elinor and her friends learn what makes Olive's mom's curry so spicy; Ari's muscles hurt after playing too much baseball.

The gang hopes to get rid of the monstrous pumpkins haunting Hugo the goose's farm before the Halloween party; Nature Cat learns about catfish.

Molly and Vera want to make lumpia, a tradition from the Philippines, for Vera's mom; a bunch of ladybugs gets loose in the Trading Post during a spooky sleepover.

Muffy's dad is the new soccer coach; Binky refuses to play in band practice.

Orli and Ozzie must find two grown-ups lost in HQ; Odd Squad goes undercover at a villain wedding.

The Wild Kratts find a lost otter cub.

The kids learn what colors make up a rainbow just in time for a Mother's Day surprise.

The Loops go on a scavenger hunt around the supermarket to solve clues to get tickets to "Oaty Zappers on Ice"; Lyla tries to act older so she can hang out with her cousin.

Carl loves the new sweater his Pop Pop knit him, but it feels itchy when he wears it; Carl is nervous about his new school bus stop.

Daniel is excited to learn something new about Trolley.

Phoebe, Jay and Lupe practice their fire safety plan when the fire inspector visits; Phoebe and Jay buy juice from Mr. Aguilar.

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.

Ellie's so excited to be going home to Jamaica that the Wombats and Mr. E start to worry whether she'll come back; Buckley comes over for a playdate with Zadie.

Daniel is excited to learn something new about Trolley.

Muffy's dad is the new soccer coach; Binky refuses to play in band practice.

Rick Steves takes a look at the sights outside of Amsterdam, from Haarlem, to Rotterdam, Delft and Zuiderzee.

Scott visits Alaska to install a portable generator with a manual transfer switch to power hardwired appliances; Richard goes inside a dishwasher to explain each cycle; Tom repairs a piece of wood nosing.

A 1969 Woodstock jacket and program; a silk wedding gown circa 1875; Jane Peterson oil circa 1925; a visit to the International Balloon Museum.

A festival of Tibetan arts and culture in Plattsburgh, N.Y., features the work of various visual artists and performers including photographer Sonam Zoksang and freedom singer Techung.

Richard Gere narrates the life of the Buddha.

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.

Traveling across China and the American South to reveal the ancestry of novelist Amy Tan and poet Rita Dove.

Exploring the life and legacy of Black civil rights pioneer W.E.B. Du Bois, including how he transcended the social constraints of the early 20th century and worked to elevate the lives of Black people worldwide.

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.

Traveling across China and the American South to reveal the ancestry of novelist Amy Tan and poet Rita Dove.

Exploring the life and legacy of Black civil rights pioneer W.E.B. Du Bois, including how he transcended the social constraints of the early 20th century and worked to elevate the lives of Black people worldwide.

Traveling across China and the American South to reveal the ancestry of novelist Amy Tan and poet Rita Dove.

Exercises designed to stretch the hamstrings.

A full-body flexibility workout in a garden stretches all muscles and promotes movement.

Elinor and her friends set out to return Ms. Mole's glasses to her after she forgets them at school; Elinor and her friends want to bring Ms. Mole a cupcake for her birthday.

The crew tries to save the kelp forests from being eaten by sea urchins; the gang visits Mars in a daydream, hoping to meet aliens.

Molly rushes to find a new gift for her new friend, Kevin; Grandpa Nat's new drone is swept away by a dust devil.

Arthur scrambles to fix his mother's computer before she finds out he broke it; Francine gets blamed when Muffy cheats on a math test.

The agents turn to Odd Todd for help when things in town get covered in jam; agents have a hard time relaxing at lunch.

The team explores the American prairie and bison.

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

Lyla and Everett coach Luke, Stu and Idris in soccer drills before their first practice; Liana and Louise decide to switch rooms with Lyla and Luke.

Carl makes a new friend while visiting his dad; Lotta thinks if she copies Nico, everyone will like her.

Daniel makes a sea turtle for his class mural at school; Prince Wednesday and Chrissie find a caterpillar.

Phoebe and Jay accidentally get paint on the mail and have to decode addresses; Phoebe and Jay find their parents' box of memories.

Tango loses focus when Elmo tries to teach him a new trick.

Kaya's cooking class; the Wombats go on a treasure hunt.

Daniel makes a sea turtle for his class mural at school; Prince Wednesday and Chrissie find a caterpillar.

Arthur scrambles to fix his mother's computer before she finds out he broke it; Francine gets blamed when Muffy cheats on a math test.

Prague's massive castle, statue-lined bridge, Jewish Quarter and 20th-century history.

Painter Mauro Henrique demonstrates a masking primer that leaves clean lines on a window; Richard tracks down the source of a clogged drain using some high tech equipment; Scott warms up a chilly bathroom by installing an electric convection heater.

A 1969 Jasper Johns flag print; 1939 inscribed "Pinocchio" book; Imperial jade snuff bottle.

Traveling across China and the American South to reveal the ancestry of novelist Amy Tan and poet Rita Dove.

Four diverse young Jewish people celebrate their bar and bat mitzvahs in the same week.

The life and legacy of Jewish theologian and philosopher Abraham Joshua Heschel.

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.

Exploring seven animal songs found in nature and their significance in the lives of their species, from the song of the largest lemur to the song of the humpback whale.

Paleontologists uncover a whole new species of whale in a parched valley not far from Cairo.

Stories of people setting a new standard for aquatic wildlife protection, from the reefs of Indonesia to an Idaho beaver dam.

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.

Exploring seven animal songs found in nature and their significance in the lives of their species, from the song of the largest lemur to the song of the humpback whale.