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Tracking major changes in scientific understanding about Earth, from flat Earth legends to Galileo's telescope.

Moments in history that reshape the solar system and provide an understanding of the universe.

Four people on four continents face environmental change driven by climate change; as resources grow scarce, they witness shifts in wildlife behavior.

From snowy owls in the high Arctic to honey buzzards raiding hornet nests in Taiwan, a look at the extreme ways in which raptors conquer the toughest habitats on Earth.

Understanding how the brain shapes reality, including the tricks and shortcuts the brain takes to keep a person alive; with neuroscientist Heather Berlin.

When an episode of Bionic Bunny is interrupted, Carl is the only one who can recall what comes next; Larry, the class bunny, wanders off.

The Mobile Unit tries to convince Soundcheck to get back together again.

The Wild Kratts are busy coloring eggs for Easter; the bros think an adventure can be to go find the real Easter Bunny; Chris thinks it's the snowshoe hare, while Martin thinks it's the jackrabbit.

Lily and her family discover a surprise and also embark on a weather hunting expedition.

Luke, Lyla and Everett test vacuums; Lyla makes cookies using substituted ingredients.

Carl blames Nico when his special crayon breaks and Nico blames Carl when his drawing rips; Lotta tries to learn to play the alto saxophone.

Jodi's asthma makes it hard for her to run around with her friends during a game of Splat Ball; Daniel feels left out when there's no room for him to play at the xylophone.

Phoebe and Jay use Miss Jean's field guide to identify their new butterfly friend; Phoebe gets courage to perform at the talent show.

Alan has many food deliveries to make at Hooper's and needs vehicles to finish them; Elmo, Charlie, and Rosita help Alan by riding their scooter and bikes to deliver food to customers.

When Bex removes her cochlear implant and hearing aid so she can go on the waterslide, Sammy and the Wombats find new ways to communicate; the Wombats love Leiko's new mural.

Donkey must wait for all her pals to get together before she can open a big present; Panda throws a party on Planet Purple to celebrate his mama's birthday.

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

Coach Cora helps the Beeples train for a track and field competition; as a toy store salesperson, Dev finds a way to feel calm in order to help the Beeples find toys.

Alma and André help Junior write a story; Alma and Eddie surprise Nestor and Gloria.

A routine science expedition with Grandpa Nat and Nina becomes a rescue mission; Molly and Mom join Randall and his family in Sitka for their traditional canoe trip to Celebration in Juneau.

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.

Appraisals from the grounds of Winterthur Museum, Garden & Library in Delaware include a valuation of a $125,000 family treasure.

Understanding how the brain shapes reality, including the tricks and shortcuts the brain takes to keep a person alive; with neuroscientist Heather Berlin.

Exploring ancient Istanbul, the crossroads of Europe and Asia.

A spring journey through Spain, Slovenia, Italy and Greece reveals how various cultures celebrate the Easter holiday.

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

A regular panel of guests from across the political spectrum discuss the biggest international stories of the day.

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

A panel of journalists provides reporting and analysis of the major stories emanating from the United States capital.

Margaret Hoover leads interviews and debates.

Following the dancers of the Martha Graham Dance Company as they tour the world.

Behind the scenes of the 1964 stage premiere of "Swan Lake," choreographed by Russian dancer Rudolf Nureyev.

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

A panel of journalists provides reporting and analysis of the major stories emanating from the United States capital.