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Investigating explosions in Siberia and other evidence that melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

Survivors race to rebuild stronger one year after the wildfires in LA.

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

A look at the documentary series by Ken Burns that illustrates how the American Revolution came to life.

A portrait of Mermaid and Milan, emerging runway divas in the drag ballroom community.

The efforts of a group of intrepid reporters to let the world know the truth about the bombings of Japanese cities Hiroshima and Nagasaki during World War II.

A look at the documentary series by Ken Burns that illustrates how the American Revolution came to life.

America Ferrera and Darren Criss uncover their immigrant roots.

Muffy helps Francine deal with the death of her Bubbe; Arthur and Buster try to make the family vacation more exciting.

Agents talk about how gadgets helped them; someone with an odd problem visits headquarters.

Clifford dreams he is a little dog; Emily Elizabeth, Clifford and the gang help Mrs. Clayton deliver invitations by way of the Big Red Delivery Service.

Sunspot begins to act strangely when Mindy, Jet, Sean and Sydney use a solar panel to improve energy efficiency.

Everyone meets everyone on the first day of Hero Elementary; Sparks' crew goes on its first mission to catch a baby hamster.

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

The kids meet some of the biggest dinosaurs, including Allie Alamosaurus; the family goes on an overnight camping trip.

Olive and Elinor learn about echoing voices when playing Marco Polo with Ari; while at the lake, Elinor and her friends realize they can't see ears on certain animals.

Willard Wigan shows Yadina that slowing down can help her make friendship bracelets more carefully; Maria Sibylla Merian shows Brad that he can have fun while waiting for flowers to grow.

Rosie, Javi and Uncle Steve use landmarks to get to Calvin's bakery; Rosie, Iggy and Javi lose their Easter eggs.

Daniel is excited to share his book at show and tell; Daniel and Katerina have a tough time waiting at a restaurant.

Fergus plans an epic anniversary date for Felicia; the Fishmans want to put on an underwater circus act for the Treeborhood.

Molly faces big obstacles while training for a cross-country ski race; Molly and her family lose their lunch when a seal sneaks onto their boat and steals their food during a fishing trip.

Carl makes a new friend while visiting his dad; Lotta thinks if she copies Nico, everyone will like her.

Pinkalicious, Peter and Kendra explore a hedge maze; Pinkalicious and Peter open a pet-sitting service.

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

Nina and Abby help Rudy feel less scared about going to the doctor; Tango runs away from Elmo at bath time.

Alma is excited when she grows a pepper that looks like Chacho; Alma rides the 6 train all day.

Japan's disaster relief; Asia news; business and global current events.

International scholars examine various cultural aspects of Japan in bold, original ways, as they explore the nation's lifestyle and traditions.

Japan's disaster relief; Asia news; business and global current events.

An in-depth portrait of Asia today, covering its dynamism as a center of growth.

Sloth bears have unique powers, including the ability to harness the power of suction to acquire food.

The Hunters search for a way to monitor the weather after they lose power during a thunderstorm.

Muffy helps Francine deal with the death of her Bubbe; Arthur and Buster try to make the family vacation more exciting.

Agents talk about how gadgets helped them; someone with an odd problem visits headquarters.

Business and global current events.

English-speaking visitors travel the length of Japan, exploring the local culture, meeting the people and offering travel hints rarely found in guidebooks.

News. Reporting on the day's international news from London and from BBC correspondents around the world.

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