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The crucial ecological roles that beetles play in nearly every environment, and why they are often regarded "the most important species on the planet.".

Relationships aboard the ISS are tested when war breaks out on Earth.

Robots are first conceptualized in ancient Rome; how uses for robots have evolved over the centuries, from the calculator to the Roomba; what future robots might be able to do.

The roots of basketball pros Brittney Griner and Chris Paul.

Arthur, D.W. and Buster build sand castles at the beach; Buster goes out of his way to avoid germs.

Ms. O and her team are determined to win a Jackie Award; Ms. O and Oscar accidentally switch bodies.

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

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

The Loops celebrate the day they met Stu; Liana finds crumbs on Louisa's pillow and accuses her of taking the last cookie.

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.

After Miss Elaina loses her mitten, her mom teaches her how to put things away so she can find them later; Prince Wednesday loses his comic book.

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.

Zeke is anxious about a big storm; Zeke turns into a "Wish Monster" when Zadie and Malik make his wish come true.

A noisy penguin interrupts band practice; the pals work together to win Gator's latest game show.

Rosie, Iggy and Crystal make a movie; Mom finds a photo from the day they got Gatita.

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

When Tia Gloria can't make it to Alma's spring concert, Alma brings the concert to her; Alma helps Safina with the puppies at the animal clinic.

Suki makes an important archaeological discovery when he digs up an old bone tool covered with markings; Molly runs a contest to design an original flag for the Denali Trading Post.

Ibn Battuta shows Brad that a change of scenery might help him finish his comic book story; Beulah Louise Henry inspires Yadina to keep working on her invention.

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

After Miss Elaina loses her mitten, her mom teaches her how to put things away so she can find them later; Prince Wednesday loses his comic book.

George Patton's gold World War I trench watch; a 1949 Charles Loloma pot; a 1944 Joseph Erlanger's Nobel Prize and diploma.

Windy waves rush to crash upon the rocks under stormy skies.

A green valley, mountains and water.

Actors Cliff Parisi and Judy Parfitt ("Call the Midwife") team up with Catherine Southon and Phillip Serrell; they start their hunt for antiques in Kent before heading to an auction in Norfolk.

Artists who use narrative to communicate personal and universal truths, including Nicholas Galanin, Julie Schafler Dale, Linda J. Mendelson, George Rodriguez and Christina Bothwell.

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

Panel of experts answer lawn & garden questions.

A young governess falls in love with her brooding and complex master, however, his dark past may destroy their relationship forever.

Rounded-top windows are installed; easy-install roof shingles go down; Roger takes Kevin fishing; Tommy adds a diamond shingle siding detail; radiant heat goes in somewhere unexpected: the ceiling.

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.

Ten home cooks create dishes that express their unique stories and talents; home cooks put their own original spin on regional dishes and ingredients.

Nine cooks present their favorite go-to quick meals and crowd-pleasers; recipes range from shrimp tacos to spicy Sriracha pasta.

The crucial ecological roles that beetles play in nearly every environment, and why they are often regarded "the most important species on the planet.".

A chameleon searches for a mate in Madagascar; a Scottish water vole swims a lake, climbs a waterfall and scales a mountain to find a place to raise her pups.

Four members of the Artemis II crew embark on a perilous 10-day journey to orbit the moon.

Muffy, Francine and Molly make their own movie; D.W. wants to get married.

With a spike in oddness in the U.K., Department of Help Agent Ozzie suggests they send for help from another agent; with a creature on the loose and Captain O unable to help, Ozzie and Orli must work together to capture it and save HQ.

Martin and Chris try to rescue a foal who is separated from his mother by a rogue wave.

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

Four kids feel like they don't belong on their first day of school until they learn that friendship and fun come from sharing who they are.

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

Rosita and Elmo play Beach ball Bop around Sesame Street, a game where they hit a ball into the air and don't let it touch the ground; Elmo feels angry and yells at Rosita when he hits the ball and accidentally knocks over his block tower.

Malik learns the key to a successful "Brother Day"; Zeke and Louisa wait tables at the Eat 'N Greet after Duffy sprains her ankle.

Donkey feels jealous when Grampy gives Panda a piano lesson; Duck is disappointed when she misses her favorite band.

Rosie, Javi and Papa use different kinds of transportation to bring Tia her lucky spoon before her train leaves; Crystal's disc gets stuck in a tree.

Elinor and her friends are inspired to build a nest; Elinor and her friends learn that it is good to eat different types of foods.

Alma senses that Beto is hesitant about breaking his piñata and wants to find out why; Alma regrets her decision to give away an old toy she doesn't play with anymore.

While fishing, Molly and her cousin, Randall, encounter a sea lion with a strange word written on its back; Molly's scout troop halts its hike when Trini scrapes her knee.

Jesse Owens encourages Brad after he becomes frustrated with bowling; Ella Fitzgerald inspires a nervous Brad to go to a dance party.

Rosita and Elmo play Beach ball Bop around Sesame Street, a game where they hit a ball into the air and don't let it touch the ground; Elmo feels angry and yells at Rosita when he hits the ball and accidentally knocks over his block tower.

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.

Topps uncut card sheets from 1973; a ring collection circa 1970; a 1967 Ram Kumar oil painting.

Sampling the flavors of Trondheim, Norway; Britannia Hotel; salmon fishing.

A culinary tour showcasing the rich food traditions of New Orleans.

Original American monuments and the stories behind American favorites, from the Vietnam Veterans Memorial to Confederate soldier monuments.

Airplane engine parts; Civil War cannon; a 20th-century saddle may have belonged to a rodeo cowboy who created the role of the Hollywood stuntman.

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.

The life, career and music of Dolly Parton are reflected in interviews with friends, companions and the artist herself, mixed with clips of Parton's performances.

Artists and groups from the 1960s perform, including Davy Jones of The Monkees, Paul Revere & the Raiders, The Miracles and Peter Noone.

Exploring the hottest place on Earth; an ultra-marathoner runs in the summer heat; the mayor of a town of one; an elder of the Timbisha Shoshone Tribe.

Venturing into the wilds of Idaho to explore its evolving outdoor culture; ranchers and backcountry pilots share the wilderness with resettled refugees; how climate change impacts an age-old salmon fishery.

From first date cuisine to sentimental recipes passed down through generations, eight cooks prepare comfort foods and a dish inspired by a loved one.

From picnics to tailgating to poolside, seven cooks prepare grab-and-go handheld treats and the ultimate in outdoor dining.

The six remaining home cooks present their favorite special occasion and holiday recipes, which include modern takes on classic gourmet fare and old-time family recipes.

Folk singer Ella Jenkins teaches a song with movements; Fred Rogers and his grandson pretend to be elephants.

Arthur, D.W. and Buster build sand castles at the beach; Buster goes out of his way to avoid germs.

Issues concerning the Omaha community.

Social, political and economic trends of American agriculture.

Agricultural business decisions.

Summer peaches; making a peach and tomato panzanella salad at peak season; a California almond farmer whose parents emigrated from India; an Alaska family builds a flour factory on their barley farm.

Baratunde Thurston explores the diverse array of regions across the U.S. and how the landscapes shape the way Americans work, play and interact with the outdoors.

Panel of experts answer lawn & garden questions.

Cooking chicken, legumes, crockpot recipes, soups, meat and classic casseroles.

Cast and creators provide behind-the-scenes insights into Season 6.

Exploring the night sky with photographer Travis Novitsky as seen from Voyageurs National Park, the Boundary Waters Canoe Area Wilderness and Quetico Provincial Park -- areas that together comprise the world's largest designated Dark Sky sanctuary.

Rick Steves explains how food helps define cultures across Europe -- from Holland and Italy to Bulgaria and Spain.

Songs from the Mannheim Steamroller Christmas annual tour include "Deck the Halls," "God Rest Ye Merry, Gentlemen," "Silent Night" and more.

The musical roots of Karen and Richard Carpenter with performance footage and television interviews; songs include "(They Long to Be) Close to You," "Superstar" and "We've Only Just Begun.".

Celebrating the spirit that built rock and roll with performances from John Fogerty, Peter Frampton, Michael McDonald, Sheryl Crow, Lynyrd Skynrd, Bruce Springsteen and more.

Cast and creators provide behind-the-scenes insights into Season 6.

Exploring the night sky with photographer Travis Novitsky as seen from Voyageurs National Park, the Boundary Waters Canoe Area Wilderness and Quetico Provincial Park -- areas that together comprise the world's largest designated Dark Sky sanctuary.

The life, career and music of Dolly Parton are reflected in interviews with friends, companions and the artist herself, mixed with clips of Parton's performances.

The Neighborhood's garbage problem is solved through a cooperative effort.

Muffy, Francine and Molly make their own movie; D.W. wants to get married.

Martin and Chris try to rescue a foal who is separated from his mother by a rogue wave.

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

Lyla gets a strike her first time bowling but gets frustrated when she realizes bowling isn't as easy as she thought it was; Lyla feels left out when Everett and Ale's friendship thrives.

Carl and Sheldon are on a thank-you mission; Carl shows his friends the right way to play with pet rocks.

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 learn how to keep cool while using their thermometer to track the temperature in the apartment; Pete and Grandma Annie teach the kids how to tell time.

From the bustling streets of Madrid to the rugged countryside, exploring the wonders of classic Spanish craftsmanship in food, fashion, ceramics, jewelry and more.

This film by documentarian Ken Burns presents the history of the Statue of Liberty. The production traces the iconic American landmark back to its creation in the outskirts of Paris, where sculptor Frédéric Auguste Bartholdi meticulously designed the massive statue, which was eventually assembled on a large pedestal overlooking New York Harbor. Numerous cultural luminaries offer their thoughts on

A 2002 patriotic celebration of America and pop oldies music, featuring artists from the rock, pop and doo-wop days of the 1950s to early mid-1960s.

Songs from the Mannheim Steamroller Christmas annual tour include "Deck the Halls," "God Rest Ye Merry, Gentlemen," "Silent Night" and more.

Broadcast performance clips from 1956 include Elvis Presley's appearances on "The Ed Sullivan Show" and "The Steve Allen Show.".

Billy Joel's record-breaking 100th consecutive performance at Madison Square Garden; special appearances by Sting and Jerry Seinfeld.

Edith is enthusiastic about her wedding and hopes to convince her family that Strallan's age does not matter. With Downton's finances dire because of Robert's actions, Mary takes matters into her hands -- but the personal price may be high.

Exploring the night sky with photographer Travis Novitsky as seen from Voyageurs National Park, the Boundary Waters Canoe Area Wilderness and Quetico Provincial Park -- areas that together comprise the world's largest designated Dark Sky sanctuary.