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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.

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

An Edgar Allan Poe daguerreotype; a Teco collection circa 1905; a 1907 Frank Lloyd Wright archive.

Thoreau returns to society, taking on roles as surveyor, scientist and abolitionist, and makes two more Maine trips; Thoreau writes with renewed energy as he faces a lifelong illness.

Actresses Debra Messing and Melanie Lynskey explore the stories of their ancestors whose bold decisions reshaped their families.

George spends time with his new friend, Carl, who has Asperger's syndrome; D.W. and James ask their siblings to coach them through the pre-school swim meet.

The team learns about friction and how to slow down a moving object when a masked villain takes over the Mobile Unit van's computer.

On their annual laundry day, the Kratt brothers disagree on whether blue oceans or green forests are better; Aviva demonstrates how oceans and forests work together.

It's an exciting day for Lily and her family when they move into their new house.

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

Carl takes his friends on an "Amazing Smell Tour of Fuzzytown," but Lotta doesn't agree with Carl's list of the best smells; Carl and his friends go on a camping trip.

Daniel has many activities he wants to do with Juan Carlos, but Mom reminds him to ask his guest what he wants to do; Daniel can't wait to show Juan Carlos the Clock Factory.

Phoebe and Jay set a new record for the longest paper airplane fight; Phoebe and Jay learn how to build a stable pillow fort.

Abby, Big Bird and Cookie Monster play against Gabrielle, Zoe and Elmo in I Wonder If We Can Use This, a game where they figure out if items can be used for something.

Malik enters the Undergroundborhood to retrieve JunJun's favorite ball; the Wombats cheer up Buckley with balloons.

Duck Duck learns how to fix her broken bookcase; Donkey welcomes Greeble the Treeble to Someplace Else.

Rosie learns about a surprise for a sister, and tries to find out who that sister is; Rosie looks for someone to be her twin.

Honeybees disturb Elinor, Art, Olive and Koa during their picnic in the forest; the kids work together to move their dirt bike path so turtles can get to the water.

Alma wants to hang out with Eddie's friends, but doesn't like it when she starts to feel like a little kid; Junior becomes everyone's pretend little brother.

The kids create a new game called Mollyball; Molly convinces a travel guide writer to visit Qyah, so the village can be added to the guidebook.

Louis Pasteur helps Xavier with his volcano experiment project; Rachel Carson helps Brad figure out a way to help butterflies migrate.

Using tactile stimulation to increase circulation.

Author Tom Poland and photographer Robert Clark talk about their book, "Carolina Bays: Wild, Mysterious, and Majestic Landforms.".

Exploring the relationship between humans and the skies, from how ancestors used the sky to navigate and tell time to the birth of modern science.

Exploring China's history, beginning at a festival devoted to ancient gods; China's first emperor; traveling the Silk Road; Tang dynasty.

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

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.

Branson's political views land him in hot water, and Sybil's loyalty is tested to the limit. Meanwhile, Ethel is torn between head and heart as she makes a difficult decision about her son's future. Elsewhere, Anna is dispirited at Bates' silence.

Irish folk singer Karan Casey.

As hope fades in prison, Edmond meets Abbé Faria, who tells him the location of a legendary treasure hidden on the island of Monte Cristo.

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

Exploring the relationship between humans and the skies, from how ancestors used the sky to navigate and tell time to the birth of modern science.

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.

Ari tries to make the world's tallest toy block tower, but it keeps falling over; Elinor and Ari try to teach Ari's baby sister how to walk.

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.

Exercises for fingers, gait and back strengthening.

Southwest Virginia skillet rack of lamb; homemade tzatziki; braised radish and mint couscous; Pinot Noir.

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

Evidence from archaeology, Roman historians, Jewish texts and the Gospels suggest that Roman power politics brought about the events that eventually led to the crucifixion of Jesus Christ.

Evidence from archaeology, Roman historians, Jewish texts and the Gospels suggest that Roman power politics brought about the events that eventually led to the crucifixion of Jesus Christ.

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 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.