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Bella is stunned when Cecil shows up and says he wants a divorce; Alice meets Carlo, who has moved on to a new woman; Constance encounters a charming local.

A new tiger mom must keep her growing cub out of trouble while the returning male "king" of Tiger Island stalks the cubs of another tiger mom.

Discovering the process behind the incredible variety of animal shapes and sizes.

A 1919 Belmont Stakes trophy; 1963 "The Avengers" comics; two Amadeo de Souza-Cardoso oil paintings.

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

How the rise of sexual reproduction fuels diversity, pushing life to specialize and shaping everything from tiny single-celled organisms to towering ostriches.

Rising sea levels threaten tiny Tangier Island in the Chesapeake Bay off the coast of Virginia.

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

Sign off.

Arthur becomes sick of Buster being a hero after his best friend rescues a cat; D.W. plays her favorite CD over and over again.

Omar has plans to surprise Orla with a 500th birthday party; the team accidentally gets locked out of its van.

The gang sees the rare Spirit Bear of the Northern Pacific while looking for black bears.

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

Lyla and Everett design a waffle costume for Stu; Lyla creates an original game to reignite everyone's interest in family game night.

Forrest can't wait to try everything at the Fuzzytown Friends Picnic, but gets into trouble when he is unable to wait his turn; Carl hosts a Super Blue Moon Sleepover.

Daniel and his friends help rebuild Music Man Stan's scene after a gust of wind knocks it down; Daniel and his friends try new games at Fall Field Day.

The Shuffler mixes everything up at show and tell; The Shuffler and The Eraser team up to put on a show that goes very wrong; a high-flying hang-gliding adventure is interrupted.

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

Cookie Monster tries to bake a new cookie for Elmo; Abby and Grover solve a puzzle of their own.

Zeke and Louise plan to build a house for Snout; Kaya hopes to make a video once JunJun conquers his on-camera jitters.

Cousin doesn't always like the way his new pet plays; the pals prepare for a silly weather event.

Rosie and Javi want to play Abuela's song for Music Night at Tia's Restaurant; Rosie wants to be an inventor.

Elinor, Ari and Olive play Snow Tag with their new friend, Gael the lynx; Ari makes friends with a rock.

Alma and Eddie try to write a song in hopes of winning the Song of Summer Contest.

Molly and Trini look for firewood to make treats, but plans are interrupted by a storm; Molly and Tooey hope to teach Trini how to skate in time for the River Skate and bonfire.

Baker Flo Braker; crunchy butter galettes; raspberry-fig crostata.

The International Rose Test Garden; replacing damaged bathroom tiles; reviewing comments from viewers.

Bella is shocked when Marco proposes and finally tells her family about her divorce; Constance tells Vito about Tommy; Alice is hurt when Carlo rejects her.

A journey down the Colorado River to discover the ripple effects of humanity's quest to conquer water.

Tracing the arc of extinction from prehistory to the present, from fossils entombed in tar to cells frozen in hope.

Discover finds in Spokane, including a 1961-1963 JFK archive, a grotesque face jug and "Gone with the Wind" sketches; can you guess which is valued at $60,000 to $80,000?

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

Patricia and Valentín progress quickly; Rita develops a medical worry; Cristina's revenge against Ana threatens others; Mateo runs into an old flame.

Two window experts use one original window to repair another original window; building a cedar bracket to support the roof; a factory that fabricates pine flooring from salvaged wood.

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

Sign off.

Buster receives chocolates in the mail and tries to figure out who sent them; James receives a toy lamb that is said to give its owner special powers.

On the town's football derby day, Osric tries to solve a case while being followed by a documentary crew; Techie Tallulah heads to Niagara Falls on a mission that will get Orli out of Precinct 97531 so she can carry out her evil plan.

The Wild Kratts are accidentally miniaturized while adventuring in the Amazon; they set out to retrieve the Miniaturizer stolen by a monkey, relying on the powers of the poison frog.

The kids help Al put on a one-of-a-kind weather presentation when the power goes out.

Lyla and Stu make a mess decorating cupcakes; Lyla tries to retrieve Everett's lost coin.

Forrest makes too many plans on the same day; Carl and Arugula build an epic marble run but fail to get the marble to run.

Daniel is excited to share his book at show and tell; Daniel and Katerina have a tough time waiting at a restaurant.

A Lettersaur is loose in Reader Valley; things go crazy when Mr. More uses Princess Presto's wand; The Shuffler has a new dance.

Phoebe learns what privacy signs are and how to use them to communicate to neighbors; Jay gets nervous about getting a haircut.

Elmo and friends have until the end of the day to set the record for the tallest cookie tower ever.

The Wombats build a wind chime to help Great Uncle Duper fall asleep; Zeke tries to make Snout out of clay.

The pals vote on different ideas for what to do with a giant rainbow potato; Donkey needs extra help to catch hopping honeyberries in Grampy's garden.

While trick-or-treating, Rosie and Javi try to avoid a pirate ghost who may be haunting the cul-de-sac; Rosie and Javi offer to help make Crystal's haunted house spooky.

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

Alma and Rafia want to make an animal photo book, but the animals won't cooperate; Alma and Rafia volunteer to help Safina after she hurts her arm.

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

Craig Kominiak prepares loaves of bread and focaccia. Host: Julia Child.

Turning a reclaimed beam into a fireplace mantel; changing a bathroom faucet; innovations to geothermal installations.

George threatens to withdraw money from the hotel, so Bella begins a new business.

Researching the identity of America's first peoples leads to Amazonian cave paintings, Mexican burial chambers, New Mexico's Chaco Canyon and waves off California's coast.

The rise of great American nations, from monarchies to democracies; lost cities in Mexico; a temple in Peru; a potlatch ceremony in the Pacific Northwest; shell beads in upstate New York.

A U.S. Secret Service archive circa 1900; a 1965 Noah Purifoy Watts riots sculpture.

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

A panel of journalists provides reporting and analysis of the major stories emanating from the United States capital.

Jason Kelce hosts a musical celebration of our nation's heroes, past and present; training at the United States Military Academy at West Point; members of the 3d U.S. Infantry Regiment "The Old Guard.".

Jason Kelce hosts a musical celebration of our nation's heroes, past and present; training at the United States Military Academy at West Point; members of the 3d U.S. Infantry Regiment "The Old Guard.".

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

Sign off.

A flashlight factory; Lady Elaine angers X the Owl when she doesn't knock.

The penguins must choose a team captain for the Belly Bowl; the CyberSquad introduces voting as a fair way to decide.

The gang sees the rare Spirit Bear of the Northern Pacific while looking for black bears.

The Hunters investigate a mysterious rain that happens with no clouds in the Indonesian rainforest.

Lyla and Everett design a waffle costume for Stu; Lyla creates an original game to reignite everyone's interest in family game night.

Forrest can't wait to try everything at the Fuzzytown Friends Picnic, but gets into trouble when he is unable to wait his turn; Carl hosts a Super Blue Moon Sleepover.

Daniel and his friends help rebuild Music Man Stan's scene after a gust of wind knocks it down; Daniel and his friends try new games at Fall Field Day.

Alpha Pig gets stuck inside the digital e-comic world of his Super Story tablet; Letter-bot malfunctions and thinks everything is litter; the Shuffler has the hiccups.

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.

Cookie Monster tries to bake a new cookie for Elmo; Abby and Grover solve a puzzle of their own.

Zeke and Louise plan to build a house for Snout; Kaya hopes to make a video once JunJun conquers his on-camera jitters.

Cousin doesn't always like the way his new pet plays; the pals prepare for a silly weather event.

Rosie and Javi want to play Abuela's song for Music Night at Tia's Restaurant; Rosie wants to be an inventor.

Creating an above-ground life-size demonstration of a sewer line in the backyard; stabilizing squeaky stairs; installing new pocket door hardware.

Two window experts use one original window to repair another original window; building a cedar bracket to support the roof; a factory that fabricates pine flooring from salvaged wood.

The evolution of smart home tech; installing a smart privacy film on a window; designing a Santa Fe garden walkway.

Using a water demo to spot common gutter mistakes; turning an old mini-split into a smart app-controlled unit; reinstalling stucco foundation skirting.

The Mercedes-Benz CLA250+ Electric luxury sedan; the all-new Audi Q3; "Your Drive" DIY garage segment.

Vivian chooses to use the butter bean for her new veggie burger.

Actors Hayley Mills and Stephen Tompkinson go head-to-head in an antiques challenge; they drive around the Northeast in a vintage E-Type Jaguar and a Rolls-Royce; the "Wild at Heart" co-stars seek expert guidance as they visit antique shops.

A death at a spiritual retreat uncovers secrets as Jasper confronts a dark mystery.

Science, health, technology and environment experts and professionals address issues such as artificial intelligence, medicine and climate science.

Margaret Hoover leads interviews and debates.

The Mercedes-Benz CLA250+ Electric luxury sedan; the all-new Audi Q3; "Your Drive" DIY garage segment.

Jason Kelce hosts a musical celebration of our nation's heroes, past and present; training at the United States Military Academy at West Point; members of the 3d U.S. Infantry Regiment "The Old Guard.".

Sign off.

Mr. McFeely delivers a book with a misprint.

Hacker claims to have become a good guy, and decides to run for election against Motherboard. Guest starring Al Roker.

The Wild Kratts are accidentally miniaturized while adventuring in the Amazon; they set out to retrieve the Miniaturizer stolen by a monkey, relying on the powers of the poison frog.

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

Lyla and Stu make a mess decorating cupcakes; Lyla tries to retrieve Everett's lost coin.

Forrest makes too many plans on the same day; Carl and Arugula build an epic marble run but fail to get the marble to run.

Daniel is excited to share his book at show and tell; Daniel and Katerina have a tough time waiting at a restaurant.

The Shuffler traps the Super Readers in a high-tech maze; Mr. More and The Eraser wage a battle of opposites.

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 and his friends prepare as a big storm approaches Sesame Street.

It's a busy time for Arthur as he and his family prepare for Thanksgiving while the elementary students prepare for the annual Thanksgiving parade.

While trick-or-treating, Rosie and Javi try to avoid a pirate ghost who may be haunting the cul-de-sac; Rosie and Javi offer to help make Crystal's haunted house spooky.

Alma and Rafia want to make an animal photo book, but the animals won't cooperate; Alma and Rafia volunteer to help Safina after she hurts her arm.

A sketch of a man while he was a prisoner in a German war camp; the Seadrome, a floating airport anchored to the ocean floor.

Actors Hayley Mills and Stephen Tompkinson go head-to-head in an antiques challenge; they drive around the Northeast in a vintage E-Type Jaguar and a Rolls-Royce; the "Wild at Heart" co-stars seek expert guidance as they visit antique shops.

Vivian chooses to use the butter bean for her new veggie burger.

How pigeons overcome the challenges of city life and thrive alongside people in London and New York.

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

After a setback on Broadway, director Charlie Summers returns to his hometown and reluctantly joins the amateur musical theater society.

Charlie's desperation to get back to Broadway draws him to the Pizazz local theater.

Charlie champions Gloria's vision, despite Adrian's resistance, which leads the ensemble to look to Charlie as the new director.

Rehearsals flourish under Charlie's direction; Mia shines; Gloria and Connor grow closer; Jacqui's jealousy stirs conflict.

Charlie's impulsive vision disrupts Nicky's schedule; tensions flare at Pizazz, leading a frustrated Charlie to show his true feelings.

Opening night dazzles, but resentment could undo all Charlie's hard work.

When Jasper's former mentor is murdered, a suspect is arrested but the truth hides darker secrets; Jasper risks everything to expose the killer.

Maigret and his team close in on Olga Borysenko's murderer; however, the investigation lands Maigret in more danger.

The British police join forces with the DEA to take down the international money laundering operation; in Tenerife, John Palmer has an unwelcome visitor as the pressure builds.

Blues rock musician Gary Clark Jr. performs highlights from "JPEG Raw"; Black Pumas present selections from "Chronicles of a Diamond.".

Sign off.

The parents and their children promise not to watch TV for an entire week; Arthur learns that Binky can't sleep without a night light.

An ancient stone warrior has been let loose in the Museum of Natural Odd; the Mobile Unit gets ranked low on the Odd Squad Magazine progress reports.

When a rogue wave crashes into the Tortuga, the Wild Kratts get separated; Jimmy and Aviva end up on rafts in the middle of the ocean. Koki is trapped on a sinking Tortuga.

Unexpected humidity threatens to jeopardize Corky's video for the science day celebration at school.

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.

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.

Prince Wednesday plays house with Daniel and Katerina Kittycat; O the Owl isn't so sure about Miss Elaina's backward play date.

Mr. More takes letter m's and makes more Mr. Mores; Alpha Pig's transforming shoes go haywire; Power Paige wants a Miss Mega comic.

Phoebe and Jay learn how to sort items; Phoebe and Jay learn how to make food labels, so everyone can participate in the potluck.

After looking at the moon through Yasmine's telescope, Tamir, Elmo and Zoe pretend to be astronauts traveling to the moon.

Zadie must face her fear and go to the barber for a haircut; Malik discovers smart devices have limitations.

The pals help Donkey plan a party for Stanley, but their ideas are different from hers; Panda discovers his favorite style of music.

Things get out of control when Rosie starts a pet-sitting business; Rosie plays with a rock from Javi's rock collection.

The kids travel to Moose Mountain to retrieve Ari's plushie after it gets taken by an eagle.

Alma learns what it means to only take what you need when she takes too much corn from the community garden; Alma wants to tag along with Mami and Junior.

Molly wants to keep a frog as a pet -- until she realizes it requires high-maintenance; Molly and Tooey can't wait to see the petroglyphs at the beach.

Cookbook author Alice Medrich prepares a chocolate ruffle cake.

Installing landscape lights in a garden; how siphons are used to make a toilet work; organizing tools with a pegboard; repairing a brick walkway.

Bella attempts to get her new business off the ground; an old enemy visits Cecil.