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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.