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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.

Henry David Thoreau pursues a career as an author, retreating to a cabin in the woods to live simply and write.

Thoreau finds solace in nature and writes two books at Walden Pond; over his two year stay, an expedition to Maine and an act of civil disobediance protesting slavery reshape his idea of freedom.

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.

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

Omar gets stuck in a white void all by himself; Opal and Oswald search the Old Woods to find ingredients for the antidote to help Omar's case of Clown-i-tosis.

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.

The Hunters try to help an injured bird so it can join its friends migrating south for the winter.

Lyla and Everett make a lemonade stand to raise money for the animal shelter; Lyla and Everett learn Double Dutch to become part of a neighborhood crew.

Carl loves the new sweater his Pop Pop knit him, but it feels itchy when he wears it; Carl is nervous about his new school bus stop.

Daniel meets a new friend, Max, who is autistic; Daniel and his friends help make Max more comfortable at Chime Time.

Phoebe plans a birthday surprise for Grandma; Phoebe and Jay must tend to the bell pepper in the garden.

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

Zadie helps Malik design a faster route to bring ice cream to a sick Sammy; Zadie tries to host a fun campout.

Duck Duck can't figure out how to fly Harriett's new Swoop-a-rino; Donkey takes Duck Duck on an adventure.

Rosie tries to send Abuela a birthday party in the mail; Rosie tries to send Gatita in the mail.

Elinor learns how webbed feet help ducks and other animals get around in the water; Elinor and Olive plan a camping breakfast for Elinor's dad's birthday.

Alma teaches Emi how to be like her, but now Emi won't stop imitating Alma; Alma tries to finish running the world's longest race.

A tribute to Loretta Lynn.

Grammy Award-winner Robert Glasper performs songs from "Black Radio"; DOMi and JD Beck perform tunes from their debut album "Not Tight.".

Recording may hold evidence used in the World War II treason trial of Iva Tugori; possible photo of Lakota warrior Crazy Horse.

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

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

Presenting a round-up of the most recent news and developments from across the world.

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

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.

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

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.

Sidney tries to stop a killing spree as Geordie's life hangs in the balance; Sidney's romantic life falls apart.

Lucian pleads with Constance to run away with him after Nish is discovered dead.

Lionesses teach their cubs how to survive by showing them how to tackle giant buffalo; burrowing owls provide an underground nest for their chicks and mimic rattlesnakes' sound to protect them.

David Attenborough explores plants in the tropical rain forest.

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

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

Presenting a round-up of the most recent news and developments from across the world.

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

Taking viewers to the often unknown gems of central Pennsylvania; the landscape serves as a backdrop for the exploration of the people, places and culture that make the region unique.

State history and events.

Laying out the wiring for radiant floor heating; custom kitchen cabinets; work is done on the built-in bookcase.

Upgrading shutters in a historic New Orleans neighborhood; how to read fertilizer labels and choose between organic and synthetic options; upgrading battery-operated smoke detectors to a hardwired combo alarm system.

Stories of how animals react to Earth's extremes, from humpback whales to tiny butterflies and savanna chimpanzees.

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

Taking viewers to the often unknown gems of central Pennsylvania; the landscape serves as a backdrop for the exploration of the people, places and culture that make the region unique.

State history and events.