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

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.

Amid new attacks by the U.S. and Israel, investigating Iran's nuclear program; an updated and expanded investigation, drawing on reporting in Iran and in-depth forensic analysis with The Washington Post, Evident Media, and Bellingcat.

John Leguizamo explores Latino and Latina contributions to American history.

Yoga can be challenging, especially for beginners who may be apprehensive about trying something that they think is too daunting. Wanting to help those who are new to the exercise, fitness instructor Sarah Starr created an easier routine. Happy Yoga, as she calls it, is a modified program using chairs that allows people of any age or physical condition to be able to benefit from yoga. "Happy Yoga"

Miranda Esmonde-White offers an exercise program for people of all ages and fitness levels.

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

Brain, D.W. and Bud explore the inner workings of the brain; Brain may finally see a meteor shower.

Tango loses focus when Elmo tries to teach him a new trick.

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.

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.

A photo safari of Portugal's Azores Islands in the Atlantic Ocean.

Confronting threats head-on.

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

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.

Eruptions of volcanoes across New Mexico have formed craters and peak-less mountains, but they have also shaped the identity of the state and its people.

A celebration of the history and rich agricultural practices of the New Mexico city.

Based on the crime-novel series by author Caroline Graham, "Midsomer Murders" follows the efforts of Detective Chief Inspector John Barnaby to solve crimes that occur in the wealthy, isolated English county of Midsomer, a picturesque and peaceful place on the outside but one filled with amoral and snobbish eccentrics with all kinds of vices. His latest assistant is Detective Sergeant Jamie Winter.

Based on the crime-novel series by author Caroline Graham, "Midsomer Murders" follows the efforts of Detective Chief Inspector John Barnaby to solve crimes that occur in the wealthy, isolated English county of Midsomer, a picturesque and peaceful place on the outside but one filled with amoral and snobbish eccentrics with all kinds of vices. His latest assistant is Detective Sergeant Jamie Winter.

After his wife is murdered, Inspector George Gently considers retirement.

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

Correspondents report on important news events of the day. Their daily reports are also available online and on radio.

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.

Professors from St. John's College in Santa Fe, N.M., use landmark books as a starting point for conversation.

Yoga can be challenging, especially for beginners who may be apprehensive about trying something that they think is too daunting. Wanting to help those who are new to the exercise, fitness instructor Sarah Starr created an easier routine. Happy Yoga, as she calls it, is a modified program using chairs that allows people of any age or physical condition to be able to benefit from yoga. "Happy Yoga"

Miranda Esmonde-White offers an exercise program for people of all ages and fitness levels.

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

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.

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.

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.

Three curious kids explore the world of video games and career possibilities.

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.

Tiffany Studios Turtle-Back diver's lamp circa 1905; John George Brown's Making Houses of Sand Oil circa 1880; a Chinese silk dragon panel circa 1775.

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.

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.