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Rick Steves explores the rise and fall of fascism in Europe, the consequences of genocide and stories of resistance.

Rebalancing the muscle chains of the lower body.

Olive explains what happened to her old partner.

While snowboarding across the Arctic tundra, the Kratt brothers discover a mother polar bear and her young cub who are enemies, but when Zach kidnaps their calf and cub they all come to the rescue.

The Hunter kids head to the state park to learn why leaves change color.

Lyla and Luke clean their room with help from Stu; Stu learns how to play hide-and-seek.

Nico is tired of being mistaken for her twin sister; Carl is upset when Nico breaks the Lint Dinosaur Monday rules and makes a Lint Monster instead.

Prince Wednesday wishes he weren't so little; Daniel helps Dad build a playhouse.

Rosie takes Mom out for Mother's Day; Crystal takes the kids to the merry-go-round at the amusement park.

Reporters Elmo and Abby offer strategies to Nursery Rhyme characters experiencing big feelings of excitement, nervousness and frustration.

The Wombats organize the Treeborhood Talent Show; Zeke searches for a collection to call his own for the Treeborhood's Collection Bonanza.

Donkey is nervous the first time she sleeps outside; Panda forgets his poetry notebook inside Donkey's messy windmill.

Pinkalicious and her friends build a sled run out of snow; when Felix the Frost Fairy falls asleep, Pinkalicious and Peter realize they must help so there will be winter window designs when everyone wakes up.

Olive creates a lending library so she can share her books with everyone in Animal Town; Elinor, Olive and Ari make a Nature Walk for Nature Day at school.

Alma must choose a best friend to give a friendship bracelet to; Alma helps Junior find his lost dinosaur.

Molly and Tooey make an exhibit to honor Big Sulky, Qyah's oldest tree, after a windstorm knocks it down; Molly and Tooey organize a Funny Face Competition.

Xavier and Yadina overcome a sibling spat with the help of Confucius; Sacagawea helps Xavier and Brad realize that just because Yadina is younger, she can do more than they think.

Opposition in colonial North America to British policies over taxes, land and sovereignty escalates into violent confrontation; war gives 13 colonies a common cause.

Rick Steves explores the rise and fall of fascism in Europe, the consequences of genocide and stories of resistance.

A Paul Revere Jr. silver tablespoon; Harry Karsten's ice axe from his first ascent of Denali circa 1913; a Zacharias Nicholas Haida totem pole circa 1890.

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

A look at the lives of elephant bulls in Mount Kilimanjaro and Amboseli, including their drive for dominance and the social bonds that form between males.

Astrophysicists and engineers look at evidence that supports the existence of UFOs.

The investigation into secret network of curators and dealers that made profits off art stolen by the Nazis.

In the first two years of World War II, Hitler's fighting machine crushes Germany's enemies in a series of offenses called the blitzkrieg or lightning war.

Fast underwater speeds and super firepower make the Type XXI U-boat Hitler's ultimate deep sea destroyer.