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The story of how it all began -- it's 12 years earlier and Duke and Eliza meet for the very first time.

Things are going well for Eliza until a familiar face shows up to question her role at Nash and Sons; Duke receives an offer that brings their relationship to a crisis point.

Lucy Worsley investigates whether Mary I, England's first ruling female monarch, should be remembered as a pioneer or a tyrant.

Skeldate House prepares for Christmas and Jimmy's first birthday; Mrs. Hall's world is rocked by bad news.

A look at the most memorable moments from the first five seasons of the series, as well as behind-the-scenes with cast and crew.

The excavation begins with the discovery of a large brick-built oven; further investigations reveal it was part of a thriving commercial bakery.

The excavation unearths new finds; Miami University professor Steven Tuck joins the team to look for evidence of Pompeiians who may have survived the eruption of AD 79.

Michelangelo and Leonardo clash and compete in the world of Renaissance Italy, navigating a deadly world of powerful patrons, violent warfare and artistic rivalry.

The search for the lost remains of formerly enslaved Black Union soldiers who were murdered after the Civil War.

A look back at the Roman-tinged Hippodrome; ancient ritual of the Turkish bath; the Blue Mosque; the grand Hagia Sophia; Spice Market; exploring Topkapi Palace.

The Grand Bazaar in Istanbul; strolling along the Golden Horn; zipping by tram from the Old Town to Taksim Square; hopping a ferry to Asia.

A 1900 Mark Twain letter; a ruby and diamond bracelet; a Babe Ruth and Honus Wagner signed baseball.

Pretend election; trouble.

Olaf, Olive and Oren search for the magical Growing Potato when Otto starts shrinking; Ms. O explains how she became involved with the Odd Squad.

The Kratt brothers take a day off from adventuring to go camping, where they meet a mischievous little moose calf.

The Hunters try to help an injured bird so it can join its friends migrating south for the winter.

After feeling left out, Luke decides to switch places with Stu; the Loops kids throw a surprise party for their parents.

Dylan is excited to play his new game but things take a turn when the game pieces fall into a floor vent; Carl is determined to get into the FuzzyWorld Book of Records.

Mr. Malik helps the class get ready to meet his pet hermit crab; Daniel and Katerina don't want to stop playing in the snow.

Rosie tries to send Abuela a birthday party in the mail; Rosie tries to send Gatita in the mail.

Nina and Abby help Rudy feel less scared about going to the doctor; Tango runs away from Elmo at bath time.

The Wombats use a 3D printer to save Cake Day when Mr. E's cake table collapses; the Wombats create a pretend vacation to cheer up Buckley.

Daniel Tiger and Donkey Hodie meet for the first time in Someplace Else, and Daniel's special visit takes the new pals on a surprising adventure.

Pinkalicious and Peter help Flora find her goat, Greta; Pinkalicious and friends make a costume for their new mascot -- the pinkatoo.

The kids try to determine what the weather will be like for Animal Town's parade; Olive gets a bad case of the hiccups.

Alma and Eddie open a mofongo food truck but run out of time to make the mofongo; Alma challenges André to scooter races to prove she is faster.

Molly, Tooey and Trini find mysterious bubbles while canoeing on Lake Qyah; Molly, Tooey and Trini learn a ball game.

Jackie Robinson shows Xavier that it takes courage to change something that isn't right.

How big cats survive and thrive around the globe, from the solitary bachelor snow leopard in the Himalays to the swamp tiger of South Asia.

The crew travels to Atlanta to begin work on an 1890s Victorian.

As a young mother of two boys, Gina Hollenbeck maintains a positive outlook despite her stage 4 lung cancer diagnosis.

Insight to help children cope with major life changes, manage emotions and build healthy coping skills.

Groundbreaking advances are rewriting the story for many cancer patients.

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.

A regular panel of guests from across the political spectrum discuss the biggest international stories of the day, along with news-making interviews and analysis from BBC correspondents around the globe.

Chef Michelle Bernstein hears diner's reviews of restaurants.

German candy containers circa 1910; a Donegal Arts & Crafts carpet; a 1937 "The Hobbit" first U.K. edition.

A 1969 Rolex Oyster cosmograph; an English bass violin; Susan Butcher's 1990 Iditarod trophy.

Director Blake Edwards' work spans four decades and has redefined slapstick comedy through a lens that continues to resonate with directors and actors.

A look at the documentary series by Ken Burns that illustrates how the American Revolution came to life.

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

Lucy Worsley investigates whether Mary I, England's first ruling female monarch, should be remembered as a pioneer or a tyrant.

Skeldale House prepares for Christmas and Jimmy's first birthday; Mrs. Hall's world is rocked by bad news.

A look at the most memorable moments from the first five seasons of the series, as well as behind-the-scenes with cast and crew.

A Cuban family adjusts to life in the United States.

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

Everyone tries to set "The World Record" at different things; Arthur is afraid of the dark in "The Cave.".

The members of Soundcheck go missing; all of Odd Squad gets a case of the jinx.

While Martin and Chris explore the powers of the chickadee, Martin encounters an ermine.

Lily and her family discover a surprise and also embark on a weather hunting expedition.

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's favorite sour pickle scratch-n-sniff sticker loses its smell; Carl notices that his baby blanket, Knit-Knit, has a hole in it.

Daniel visits the post office and learns how letters are sorted and mailed, then sends a letter to Dad; Daniel and Dad Tiger surprise Mom with banana bread.

The family disagrees about which sport to play, so they hold a vote; Rosie and Papa enter the Cake-Off.

Grover tries to cheer up Elmo, who is feeling sad after his dad leaves for a work trip.

The wombats invent a color game; Super invents a Huggyback rider.

Donkey promises to help bathe Gregory and to also play Bubble Bonanza with Panda; the pals make up a quiet game so they don't disturb Rock Star Penguin while he tries to write a song.

With help from Mommy, Pinkalicious and Peter make a homemade go-kart called the Sparkle Speedster; Pinkalicious and friends search for ways to make the merry-go-round a little more exciting.

Elinor learns how webbed feet help ducks and other animals get around in the water; Elinor and Olive plan a camping breakfast for Elinor's dad's birthday.

Alma cheers up Lucas after he misses out on a trip to the Statue of Liberty; Alma and Andre help Dona Carmen with a recipe.

A family of beavers builds a dam that accidentally diverts water into Trini's garden, threatening her strawberries; Trini is determined to earn the Night Watchers Badge.

Cesar Chavez helps Xavier, Yadina and Brad find the inspiration to tackle a big mess in the playroom; Dolores Huerta teaches Xavier, Yadina and Brad that it is important to speak up when they see someone in need.

An investigation into the increased activity at the Kilauea volcano in Hawaii, and a look at why these geologically distinctive volcanoes formed in the middle of the Pacific.

Unsafe structures are uncovered and demolished; building a lending library; saving an oak tree.

Newlyweds Emily Bennett Taylor and husband Miles were house hunting and talking about raising a family when Emily received the news that she had stage 4 lung cancer; she and her husband recall their cancer journey.

How viruses spread, how your body fights them off, and what you can do to stay well.

Virtual town halls with medical experts cover various health issues.

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.

A regular panel of guests from across the political spectrum discuss the biggest international stories of the day, along with news-making interviews and analysis from BBC correspondents around the globe.

Piano duo Whipple & Morales, digital art at the PAMM, artist Tania Candiani.

America Ferrera and Darren Criss uncover their immigrant roots.

The efforts of a group of intrepid reporters to let the world know the truth about the bombings of Japanese cities Hiroshima and Nagasaki during World War II.

The human fallout from the first and last atomic bombs used in an act of war, dropped on Hiroshima and Nagasaki by the U.S.

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

German candy containers circa 1910; a Donegal Arts & Crafts carpet; a 1937 "The Hobbit" first U.K. edition.

A small statue thought to be from King Tut's tomb; Punch & Judy set; sword pistol.

Director Blake Edwards' work spans four decades and has redefined slapstick comedy through a lens that continues to resonate with directors and actors.

A look at the documentary series by Ken Burns that illustrates how the American Revolution came to life.

A Cuban family adjusts to life in the United States.

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

Arthur's snow shoveling business is booming, until Buster decides to compete against him; Brain wakes up to find he is a cockroach.

Opie hosts the Odd Squad Superfan tour but finds out a villain has joined in disguise; Orli and Ozzie must solve 37 cases in order to get access to an exclusive club.

Martin and Chris borrow Aviva's half finished night vision goggles to search for a mysterious nocturnal creature in the Indonesian forest.

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

Lyla and Everett make a lemonade stand to raise money for the animal shelter; Lyla and Everett learn Double Dutch to become part of a neighborhood crew.

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

Prince Tuesday baby-sits for Daniel; the kids help Miss Elaina find her locket.

Rosie and Javi make flowerpots using repurposed items for the Robot Picnic; Rosie and Javi open a car wash to clean Iggy's ride-on car.

The Amazing Zero and Elmo are on Sesame Street to help people by taking everything away when they need it to get to zero.

Zeke and Louisa open a mud pie stand; Mr. E yearns to paint a square.

Harriett encourages Donkey to try using clay in art class; Donkey and Panda do kind things all day.

Kendra and the gang learn a new dance; Iris joins the soccer team and finds that her singing talent might help the team win.

Olive and Elinor learn about echoing voices when playing Marco Polo with Ari; while at the lake, Elinor and her friends realize they can't see ears on certain animals.

Alma and Junior teach Uncle Nestor how to ride his first bike; Papi lets Alma go to the grocery store by herself.

Tooey is upset when his teacher gives him a nickname; Molly and Walter are on a boat when suddenly the engine fails.

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.

German candy containers circa 1910; a Donegal Arts & Crafts carpet; a 1937 "The Hobbit" first U.K. edition.

Touring the Atlanta Beltline; replacing the existing footings with a stem wall; adding a vapor barrier to a crawl space; a lesson on HVAC installation; touring an outdoor learning center.

Lisa Briggs' will to live proved stronger than her devastating cancer.

Practical, affordable ways to keep your furry friends healthy and happy.

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.

A regular panel of guests from across the political spectrum discuss the biggest international stories of the day, along with news-making interviews and analysis from BBC correspondents around the globe.

Protecting the fish populations of the eastern tropical Pacific.

A woman finds herself on a transformative journey as she nurtures wounded hummingbirds amid the glamour of Hollywood.

Investigating explosions in Siberia and other evidence that melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Survivors race to rebuild stronger one year after the wildfires in LA.

The impact of loneliness on your mind and lifestyle, a look at weight loss supplements and an interview with an expert on ways to be less lonely.

Eric Levin, co-founder of Record Store Day and owner of Criminal Records; Wax N' Facts; JB's Record Lounge.

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