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Learning about the Great Salt Lake's ecosystem through brine shrimp; scientists and educators at the Great Salt Lake Institute investigate whether the lake can survive; the poetry of Nan Seymour.

Experts analyze prominent international affairs topics and America's role in a shifting world.

Margaret Hoover leads interviews and debates.

A young autistic girl witnesses her father's murder but is unable to tell anyone what happened.

Alphy's trip to reconcile with his mother takes a shocking turn when a passenger is murdered and he becomes the prime suspect; Leonard defends Raymond from Geordie; Miss Scott hides a big secret.

Bates is taken aback when Vera threatens to expose old secrets which could bring down the Crawleys. Mary is the only one who can protect the family, but she pays a high price when she turns to Carlisle for help.

A young autistic girl witnesses her father's murder but is unable to tell anyone what happened.

Alphy's trip to reconcile with his mother takes a shocking turn when a passenger is murdered and he becomes the prime suspect; Leonard defends Raymond from Geordie; Miss Scott hides a big secret.

Bates is taken aback when Vera threatens to expose old secrets which could bring down the Crawleys. Mary is the only one who can protect the family, but she pays a high price when she turns to Carlisle for help.

"The Bill" stars Roberta Taylor and Trudie Goodwin set off from Glasgow and charge around Stirlingshire, concluding with an auction in Harrogate; they are accompanied by experts Paul Laidlaw and James Braxton in two very nice classic cars.

Exploring how the American Revolution affected Britain, with sabotage, espionage and political unrest reshaping the empire.

Comics Carol Burnett and Niecy Nash see family mysteries solved by DNA.

Arthur and D.W. work together to clean their rooms so they can go the park; Arthur has the winter blues.

Oscar's Oscarbots get lost in town; Otto and Olive try to figure out why people are becoming plaid and striped.

Martin and Chris stumble upon a rare and endangered seedling of a butternut tree; while looking for its parent tree, they only discover dead ones.

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

Lyla has to help multiple people but rushes each task, which makes things worse; Lyla must use her left hand after hurting her right wrist.

Arthur and D.W. work together to clean their rooms so they can go the park; Arthur has the winter blues.

Oscar's Oscarbots get lost in town; Otto and Olive try to figure out why people are becoming plaid and striped.

Martin and Chris stumble upon a rare and endangered seedling of a butternut tree; while looking for its parent tree, they only discover dead ones.

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

Lyla has to help multiple people but rushes each task, which makes things worse; Lyla must use her left hand after hurting her right wrist.

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 needs some space when O sits too close to him at the treehouse; Miss Elaina asks Daniel for more space when they make pretzels together at the bakery.

Phoebe and Jay create a game show for Grandma; Phoebe and Jay must find the best way to spend the community coin jar money by taking a building-wide vote.

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.

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.

Captain Donkey and her crew search for the Ruby Red Tater Treasure; Panda finds his favorite hoodie, but it no longer fits.

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.

Elinor is intrigued when she and her friends find a plant that has grown in a zigzag; Elinor loves her butterfly suit, but how is she supposed to drink when her arms are now wings?

Alma and Howard search for a Black cowboy in the Bronx; Alma and Junior open a play hair salon at home.

Molly and Tooey join Nina and Olin on a cave exploration to find out how old Qyah really is.

Chewy oatmeal cookies; mini prep bowls; pecan bars.

North Carolina dipped fried chicken; a tasting of chocolate ice cream; a classic version of North Carolina lemon pie.

The myths and realities of the American cowboy.

Historical appraisals from the first hour at Colonial Williamsburg.

A commercial for Grace Brothers is filmed using the store's staff.

A detailed look into news stories from around the world from the BBC news desk in Washington, D.C.

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

A Frank McCarthy oil painting; baseball autographs circa 1945; a 1977 Elvis Presley watch presented to Redd Foxx.

A 1977 Kenner Darth Vader figure; a Tippco toy motorcycle with a sidecar; a Ty Cobb professional model bat circa 1925.

Eleanor commits to Franklin's uncertain political future; Betty unexpectedly becomes second lady upon Jerry's nomination; Michelle wrestles with the consequences of Barack becoming the first Black President of the United States.

Royalty may visit Grace Brothers, so hasty preparations are made.

Europe's Neoclassical buildings of columns and domes; dramatic Romantic paintings depicting extreme emotions and nature; touring castles.

Using art as a powerful tool for healing.

Necker Island, a private British Virgin Islands retreat, features endangered animals including ring-tailed lemurs and giant tortoises; exploring the island's dedicated conservation efforts; with Richard Branson.

Sailing the British Virgin Islands, exploring vibrant marine life, pristine beaches and local culture.

The gambrel roof profiles are pre-assembled and raised; the crew stands up the second floor walls; three new apprentices from the Gen Next program learn how to measure and cut roof rafters; an engineer designs a septic system for the project.

A young autistic girl witnesses her father's murder but is unable to tell anyone what happened.

Alphy's trip to reconcile with his mother takes a shocking turn when a passenger is murdered and he becomes the prime suspect; Leonard defends Raymond from Geordie; Miss Scott hides a big secret.

Bates is taken aback when Vera threatens to expose old secrets which could bring down the Crawleys. Mary is the only one who can protect the family, but she pays a high price when she turns to Carlisle for help.

Arthur wants a Woogle since everyone else has one; Arthur is afraid of what dessert his father will make for a school party.

Mayor Macklemore catches a case of the Sing-A-Longs; Ms. O from the past appears at the office.

Stuck without power in the bamboo forests of China, the Wild Kratts must figure out how to save the pandas, who are being turned into stuffed toys by villain Zach Varmitech.

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

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.

Arthur wants a Woogle since everyone else has one; Arthur is afraid of what dessert his father will make for a school party.

Mayor Macklemore catches a case of the Sing-A-Longs; Ms. O from the past appears at the office.

Stuck without power in the bamboo forests of China, the Wild Kratts must figure out how to save the pandas, who are being turned into stuffed toys by villain Zach Varmitech.

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

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.

Donkey and Cousin Hodie figure out how to have fun in the rain; Donkey is patient while Cousin learns a new game at Grampy's Game Day.

After Daniel runs and slips at the neighborhood pool, he remembers the rules so he can stay safe; Daniel is afraid to put his face in the water at his first swim class.

Phoebe, Jay, Grandma Annie and Pete create the family's first recipe for Sunday greens; Phoebe and Jay are excited about their first campout in the courtyard.

Rudy feels angry when Abby asks him to share his toys, so his friends make a movie to show that sharing can be fun.

Sammy and Benito find a way to communicate; Sammy makes plans for his mom's visit.

Donkey and Cousin Hodie figure out how to have fun in the rain; Donkey is patient while Cousin learns a new game at Grampy's Game Day.

Phoebe, Jay, Grandma Annie and Pete create the family's first recipe for Sunday greens; Phoebe and Jay are excited about their first campout in the courtyard.

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 friends build a cardboard clubhouse; Alma solves the case of a missing piragua.

Molly and Tooey design their dream treehouse, complete with a windmill and elevator, but plans might have to change when Tooey's cat gets loose; Tooey's puppy doesn't like following directions.

Bridget and Julia learn how to make beef stir-fry with bell peppers and black pepper sauce; Jack challenges Bridget to a tasting of soy sauce; Keith shows Julia how to make scallion pancakes with dipping sauce.

Fried chicken wings on the grill; ice packs; supermarket barbecue sauce; grilled pork burgers.

The evolving meaning of the Statue of Liberty and how it embodies values and conflicts in America, from abolition to the treatment of refugees.

A review of treasures from Colonial Williamsburg.

Royalty may visit Grace Brothers, so hasty preparations are made.

A detailed look into news stories from around the world from the BBC news desk in Washington, D.C.

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

Joe Manganiello and Tony Gonzalez uncover close relatives whose names they never knew before.

Moderator Aaron Tang guides a panel through a hypothetical scenario around election issues and government integrity.

A look inside the Apollo 11 spacecraft on its historic journey includes classified mission audio of conversations between astronauts Neil Armstrong, Buzz Aldrin and Michael Collins.

Impressionist works, including Monet's lilies, Renoir's ladies, Degas' snapshots and Rodin's statues; tracing the travels of Van Gogh through his art; wild and crazy buildings in Spain.