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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.

From New York to Kolkata, dicovering the surprising and beneficial ways urban wildlife transforms cities into thriving, shared ecosystems.

The cities, cuisine, world-class attractions and natural wonders of Canada.

Ken Whiting and other top athletes demonstrate spectacular paddling during kayaking adventures in stunning locations around the world, featuring paddling, sea kayaking, canoeing, whitewater paddling and stand up paddling.

A look at global issues from food production to clean energy to housing, including stories of environmental stewardship, organic practices and Earth-friendly innovations.

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.

Twenty-four hours a day, the latest national and international stories as they break.

Miranda Esmonde-White offers an exercise program for people of all ages and fitness levels.

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

Harriett encourages Donkey to try using clay in art class; Donkey and Panda do kind things all day.

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.

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

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

Rudy feels angry when Abby asks him to share his toys, so his friends make a movie to show that sharing can be fun.

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.

Mr. E has a lot of ping-pong balls and the survey says that he should sell the purple ones; Super's lost her glasses and the Lost and Found Patrol try to find them.

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.

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

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

Rudy feels angry when Abby asks him to share his toys, so his friends make a movie to show that sharing can be fun.

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

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.

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.

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

Oscar recalls his early days at Odd Squad; Olive and Otto are trapped inside a board game.

Technological innovations in U.S. Navy aviation change the face of war.

Exploring three small islands off Sweden's southwestern coastline -- Marstrandson, Styrso and Vrango.

A detailed look into news stories from around the world from the BBC news desk in Washington, D.C.

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.

The compelling story of James J. Hill and the Great Northern Railway.