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Archaeological investigations into the origins of democracy in Greece 2,500 years ago; mass graves and ancient ruins where tyrants were murdered shine light on the birth of a revolutionary form of government.

Exploring the unique evolutionary journey of woodpeckers and the role they play in every ecosystem, except Antarctica and Australia.

Women speak out about violence in relationships and demand stricter laws; lessons learned from storm surges in Italy; public refrigerators; creative cafés against digital stress.

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

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

Margaret Hoover leads interviews and debates.

Incorporating body patting and other exercises to strengthen balance and stimulate the body and mind.

Marine botanist Sylvia Earle and Fred Rogers snorkel off the Florida Keys.

Everett faces his fear of water by taking a swimming lesson; Lyla doesn't want Miss Emmaline to move.

Lotta is determined to show Skyler that she is more than just "headphone girl"; the new kid in school causes a hullabaloo on the playground.

Daniel uses a different bathroom at the train station and Juan uses the bathroom at the Music Shop; O uses the bathroom at Jodi's house.

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

Rudy is afraid of getting a shot at the doctor's office, so Nina and Abby play pretend to show what the visit will be like so he can feel less scared.

The Squad uses math and engineering skills to fix scooters after they mysteriously break; Jackie tests her new fixing skills on a broken family heirloom.

Martin and Chris spot a hermit crab on the beach.

A foraging couple in Story City, an autism awareness advocate, and the Urban Bike Food Ministry.

Margaret Hoover leads interviews and debates.

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

Social, political and economic trends of American agriculture.

Italian artist Franco Alessandrini wants to give New Orleans a gift on its 300th anniversary and commemorate St. Pope John Paul II's 1987 visit.

Exploring seven animal songs found in nature and their significance in the lives of their species, from the song of the largest lemur to the song of the humpback whale.

A team of forensic experts excavate a giant Pliosaur skull, the largest Jurassic predator ever known.

David Attenborough explores London's Natural History Museum and meets creatures from the past, brought to life by CGI, including a giant eagle and colossal snake.

Behind-the-scenes footage and candid on-location interviews with David Attenborough, and a look at his life from his boyhood days as a fossil hunter to his many years on the road.

A new cohort of junior doctors join the midwives, including Timothy, who observes the contrast between clinical medicine and compassionate care at Nonnatus House; Violet announces her plan to shadow the midwives.

Emma convinces Harriet Smith that she is too good for Robert Martin.

Edmond locates Gaston, Villefort's illegitimate child, who has grown up to be a thief; Danglars discovers Fernand's treacherous deeds in Algeria and reveals all to the press.

Mysterious financial losses lead the Post Office to fire and prosecute village Subpostmasters who are unable to prove their innocence.

Alan Bates and the Subpostmasters begin to fight for truth and justice with new allies in Parliament.

The team is confounded by a shocking murder in a hotel elevator.

Italy's classic hill towns include San Gimignano, Cortona, Orvieto and Civita di Bagnoregio.

Exploring the home museum of Luciano Pavarotti in Modena, Italy; gelato; how Parmigiano-Reggiano is aged; touring famed car brands including Ferrari and Stanguellini; sampling historic balsamic vinegar; local Lambrusco wines.

A new cohort of junior doctors join the midwives, including Timothy, who observes the contrast between clinical medicine and compassionate care at Nonnatus House; Violet announces her plan to shadow the midwives.

Emma convinces Harriet Smith that she is too good for Robert Martin.

Edmond locates Gaston, Villefort's illegitimate child, who has grown up to be a thief; Danglars discovers Fernand's treacherous deeds in Algeria and reveals all to the press.

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

Standing and barre exercises focus on strengthening the knees, relieving joint stiffness and improving overall mobility.

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

Lyla and her sisters find a lost bag's owner; Lyla gets jealous when Ale gets attention.

Carl and his friends clean up the Fuzzytown Park; Carl accidentally breaks the birthday present Sheldon planned to give his mom.

Miss Elaina shows off her cartwheel at the carnival, prompting Daniel to try it, too.

Phoebe plans a birthday surprise for Grandma; Phoebe and Jay must tend to the bell pepper in the garden.

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 makes Grampy a special card but she gets into a few sticky situations when she tries to deliver it to him; the pals help Harriett with her new invention for penguins.

Rosie, Jun and Grandpa Liu go to the Asian Market to buy more sweet potato buns; Rosie and Javi help Tia overcome her stage fright when she goes on a television cooking show.

The kids learn about crying as they set out on an adventure to help Miri; the kids and Mr. Bat look for Ari's ball after it goes missing in a cave.

Big Dog is too big to play Little Red on Peg's stage; baby sitters Peg and Cat must figure out how to use a giant beeper.

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.

Miss Elaina shows off her cartwheel at the carnival, prompting Daniel to try it, too.

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

Phoebe plans a birthday surprise for Grandma; Phoebe and Jay must tend to the bell pepper in the garden.

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

Rukmini Devi reminds Xavier and Yadina why their annual family walk is special; Bob Ross shows Yadina that a small blunder can be a happy accident.

Alma and her friends must vote for either a new board game or art supplies; Alma and Harper open a lemonade stand.

Arthur gets chicken pox just as the circus comes to town; Arthur blames D.W. for making his dog sick.

Martin wants to check out insects, while Chris would rather investigate the spider monkey.

Tracing the trail of pilgrims, from the French border to Santiago de Compostela; running with the bulls in Pamplona; Celtic culture of Galicia.

An autographed first edition copy of Harper Lee's "To Kill a Mockingbird"; Titanic photograph and book; Rolex military watch.

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

A 1960 Ansel Adams Portfolio III: Yosemite Valley; a Persian Qashqai Gabbeh rug circa 1935; 1959 JFK's boxer shorts with signed photo.

The French-American alliance changes the war and moves it to other theaters; navies battle off England and in the Caribbean, while armies advance in Indian Country and the South; the British take Charleston.

An adventure across Iowa's scenic byways, enjoying the historic sites, unique attractions and natural beauty along the way.

A conversation with Harry Smith, the Swan Ballet, and an accessible treehouse at the Iowa Arboretum.

Felix's wedding fast approaches but Sister Boniface tries to unveil the killer in the wedding party before the big day.