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In humankind's conquest of planet Earth, improbable allies -- species recruited from nature -- are relied on to help defeat adversaries.

From runway to throwaway, a look at the global impact of fashion trends.

Investigating the future of bees, from honey bees to wild native species.

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.

Milner investigates the case of a young man found hanging in the woods. Ruled a suicide, Milner believes it was murder.

When tragedy strikes a local family, Dr. Turner's treatment comes under scrutiny; Trixie worries about the future of midwifery in Britain.

Disaster strikes at Forsyte & Co. as Soames puts an end to Irene's Parisian dreams; Louisa faces a shock eviction.

Edmond continues to infiltrate the lives of his betrayers, uncovering more dark secrets; Mercedes starts to suspect Edmond's true identity.

Sherry becomes concerned when her ex-husband, rock star Dennis Pride, comes to Bakerbury.

The stage adaptation of Jane's book endures numerous snafus before opening night.

When a famous florist returns to Kembleford for her final days, she brings glamour but also gains Father Brown's interest after the suspicious death of an angry neighbor.

When tragedy strikes a local family, Dr. Turner's treatment comes under scrutiny; Trixie worries about the future of midwifery in Britain.

Disaster strikes at Forsyte & Co. as Soames puts an end to Irene's Parisian dreams; Louisa faces a shock eviction.

Edmond continues to infiltrate the lives of his betrayers, uncovering more dark secrets; Mercedes starts to suspect Edmond's true identity.

Sherry becomes concerned when her ex-husband, rock star Dennis Pride, comes to Bakerbury.

The stage adaptation of Jane's book endures numerous snafus before opening night.

James Braidwood explains to Brad that being prepared can help him stay calm when he is feeling nervous; Xavier and Yadina learn that being responsible can involve making hard choices.

Francine bets Arthur that her family uses less water; Arthur and D.W. believe they will find treasures in the attic that will make them famous.

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.

An an athlete in the Skillsville Games, Rae manages her emotions to remain focused and score; Rae, Cora and Dev work together as party planners, sticking to a budget while throwing a surprise party for Kid Beeple.

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

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.

Katerina wishes she had a little sister; the Tiger family performs a special song during Family Day at the library.

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

Cinderella needs to tell time for the ball, but her clock is broken, so Nina, Abby and Rudy wonder what tool they can use to fix it.

When Bex removes her cochlear implant and hearing aid so she can go on the waterslide, Sammy and the Wombats find new ways to communicate; the Wombats love Leiko's new mural.

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.

Rosie helps Mom set up for story time when the Purple Knight visits the bookstore; Rosie and Javi make a strawberry horchata stand.

While helping Ms. Beaver construct a community garden the kids learn about rocks; Elinor tries to make her special dumplings all by herself.

Molly helps Grandpa Nat fix the broken fish wheel; Molly learns that her dad competed in the Native Youth Olympics.

Tiffany Studios lily sconces circa 1905; a 1904 Philadelphia quilt; a Chinese and Japanese decorative art collection.

Celebrating 10 years of "Weekends with Yankee" and 90 years of Yankee magazine; naturalist and author Sy Montgomery and artist Matt Patterson spend time with rescue turtles; the art of oyster shucking on Cape Cod.

Discovering the culture, history and flavor of New Orleans through the eyes of dynamic women shaping its future; Commander's Palace; exploring City Park, jazz halls and Mardi Gras traditions.

Mapping the roots of actress Kate Burton and media mogul Barry Diller.

Live news program produced out of BBC's Washington, D.C. bureau; host Sumi Somaskanda.

Presenting a round-up of the most recent news and developments from across the world.

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

Items reflect 250 years of American art, artifacts, crafts and collectibles; finds include a flag quilt circa 1880, a Tiffany Studios turtleback glass shade circa 1915 and an 1884 Edison light bulb.

As World War II begins, Americans unite in their disapproval of Nazi brutality and work to help refugees escape; Germany invades the Soviet Union and secretly begins the mass murder of European Jews.

Waitstill and Martha Sharp, a Unitarian minister and his wife from Wellesley, Mass., leave their children behind in the care of their parish and commit to multiple life-threatening missions in Europe. Over two years, they help to save hundreds of imperilled political dissidents and Jewish refugees fleeing the Nazi occupation across Europe.

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

Items reflect 250 years of American art, artifacts, crafts and collectibles; finds include a flag quilt circa 1880, a Tiffany Studios turtleback glass shade circa 1915 and an 1884 Edison light bulb.

As World War II begins, Americans unite in their disapproval of Nazi brutality and work to help refugees escape; Germany invades the Soviet Union and secretly begins the mass murder of European Jews.

Waitstill and Martha Sharp, a Unitarian minister and his wife from Wellesley, Mass., leave their children behind in the care of their parish and commit to multiple life-threatening missions in Europe. Over two years, they help to save hundreds of imperilled political dissidents and Jewish refugees fleeing the Nazi occupation across Europe.

Despite all the cracked eggs, the Wright Brothers encourage Xavier and Yadina to continue their egg drop experiment; the Brontë Sisters help Brad overcome writer's block.

Muffy wants a Dream Bouncy Castle for her party; Francine and Muffy set up their older siblings.

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.

Dev discovers that sorting recyclables takes careful attention; as campaign managers, Cora and Dev find creative ways to share their candidate's message in the race for Skillsville mayor.

After a groundhog predicts more winter weather, Benny is convinced he will have snow on his birthday so he plans a snow-filled birthday party.

Lotta competes in the Fuzzytown Music Maker Championship, but the noise on stage becomes too much for her and she leaves; Carl forgets his bottle cap collection at his dad's house.

As the Tiger family prepares for Margaret's birthday party, Daniel struggles when the attention is not on him; Daniel feels left out at Margaret's birthday party, until he leads Margaret and friends in a panda game and original birthday song.

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

Elmo's bike is great, but Abby's bike might be even better; Tamir teaches Elmo how to deal with feeling jealous and to enjoy the things Elmo already has.

The wombats battle sea monsters, surfing scoundrels and pointy rocks on their way to make a sandwich delivery; Mr. E. buys a robot to hand out balloons.

Donkey opens a potato stand so she can share her potatoes with her neighbors; Donkey surprises Clyde with a playdate in the sky.

Rosie and Javi both want to be in charge of the sandbox, so the kids hold an election to choose a president; Rosie and friends try to save the dino parade.

Ari tries to be quiet so his sister can take a nap, but a woodpecker keeps making noise outside; the kids learn that all animals need some sort of rest to regain energy and stay healthy.

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

A Marvel Silver Age comics collection; a Moglia micromosaic plaque of Beatrice Cenci circa 1870; 1983-1999 Barack Obama letters.

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

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

A young filmmaker explores the mysterious wetland in his grandparents' backyard.

Live news program produced out of BBC's Washington, D.C. bureau; host Sumi Somaskanda.

Presenting a round-up of the most recent news and developments from across the world.

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

Actors Ted Danson, Mary Steenburgen and William H. Macy trace their nonconformist ancestors back to the Puritan establishment.

Emily Goldberg's first person journey through the vibrant Minneapolis music scene of the 80s.