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

During World War II, American soldiers bluff the enemy using inflatable tanks and elaborate light shows.

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

Explores the world of ice core scientists who research environmental history.

Explores the world of ice core scientists who research environmental history.

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

The 25th anniversary of documentary series "The Civil War" includes video clips and interviews with Ken Burns, Geoffrey Ward, Ric Burns, Buddy Squires and others.

Filmmakers Ken Burns and Dayton Duncan reveal behind-the-scenes stories about the making of "The National Parks: America's Best Idea.".

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.

Psychotherapist and author Esther Perel.

The first herbivorous vertebrates evolve on the side of the amniote family tree leading to mammals; alongside them came apex predators like Dimetrodon.

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.

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

This daily news program, produced by Japanese public broadcaster NHK, focuses on headlines and current events in Japan and other Asian countries. English-speaking presenters also cover other areas of interest, including business news, science and technology trends, sports highlights, and global weather forecasts.

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

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

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

A look back at the Roman-tinged Hippodrome; ancient ritual of the Turkish bath; the Blue Mosque; the grand Hagia Sophia; Spice Market; exploring Topkapi Palace.

A visit to two towns claiming to be the first permanent settlement in Nevada.

Les is set adrift off the coast of Belize in a raft with no food and a bare minimum of equipment.

Father Brown suspects an ulterior motive when his old adversary Flambeau is incarcerated for murder.