K39MK-D

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.

The life of German photographer Fred Stein, whose street scenes from 1930s Paris and 1940s New York are well known. While caught up in the darkness of World War II, Fred Stein creates thousands of photographs.

Types of flower frogs that assist in arranging flowers; a beverage called the flower frog with recipes for coktail and mocktail versions.

Kings and prime ministers studied at Oxford and Cambridge universities; Blenheim Palace, the birthplace of Winston Churchill; Ironbridge Gorge.

Stretching the back of the body; forward bends; stretching and toning arms, shoulders and neck.

An all-standing workout improves balance, flexibility and mobility.

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.

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.

Warthogs and elephants discover a new manmade waterhole in the African savannah.

Remote and wild, the Yukon is a river of extremes, providing a home for bears, moose and salmon and has sustained people for centuries.

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.

A regular panel of guests from across the political spectrum discuss the biggest international stories of the day, along with news-making interviews and analysis from BBC correspondents around the globe.

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.

Journalists at Alden-owned newspapers go toe-to-toe with their owners to try to save and rebuild local journalism in America.

Caught up in an attention-driven media landscape, idealistic journalists struggle to overcome public distrust, re-shaping the future of news publishing.

Starting in the 1940s, Southern migrants fuse blues and jazz sounds, bringing Black religious music into the mainstream.