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How discoveries over the past 50 years have revolutionized people's understanding of the universe.

From Kenya to Mexico, people and wildlife find a harmonious balance in Earth's most vulnerable landscapes.

Twisting the torso to touch the toes which loosens the spine, hips and legs.

Installing vinyl siding on the main house and ADU; revealing the ADU's framed layout; reviewing basement HVAC; installing a three-panel slider to connect indoor and outdoor living.

Lawn mowing basics; how to vet and hire a trustworthy contractor to avoid costly mistakes; installing a concrete paver walkway.

Marine botanist Sylvia Earle and Fred Rogers snorkel off the Florida Keys.

Muffy challenges Francine to be nice for one week; Arthur joins a gang.

Martin encounters a lost colony of black-footed ferrets.

Benny's toy penguin is swept away by melting snow, transforming a day of sledding into an urgent rescue mission.

Lyla figures out how to do a magic trick with clues from Miss Emmaline; Luke finds a puppy.

Arugula and Carl go on an adventure as archaeologists; Carl spots a UFO on Mother's Day.

Things don't go as planned when Daniel and Dad Tiger spend the day together; Daniel and Mom's day together includes turning her old wagon into a trolley.

Phoebe, Jay and Lupe practice their fire safety plan when the fire inspector visits; Phoebe and Jay buy juice from Mr. Aguilar.

Discovering Japan by bicycle, exploring a side of Japan not found in guidebooks.

Eric Hanson treks though the breathtaking landscapes of Helena, Montana.

Installing vinyl siding on the main house and ADU; revealing the ADU's framed layout; reviewing basement HVAC; installing a three-panel slider to connect indoor and outdoor living.

Lawn mowing basics; how to vet and hire a trustworthy contractor to avoid costly mistakes; installing a concrete paver walkway.

Grilled striped bass with olive topping; two ways to shuck clams; clams with vinegar and scallion sauce; linguine with clam sauce; cod in light cream sauce.

Growing up, Sapna Pandya's grandmother often made a round, crisp snack called "crunchy pooris.".

Egg salad with grilled asparagus, corn, palm hearts, fried egg and sour orange vinaigrette; squash, black bean and queso fresco cheese pizza; Cognac flambeed grilled cheese with grilled bread.

Memories about distinguished visitors who dined at Dooky Chase; grits and quail; pecan-crusted redfish; stuffed fillet of beef.

Traditional Punjabi chicken curry; an easy homemade achar or Indian pickle; a smooth mango lassi drink.

Grilled hilltribe chicken with kua txob; the difference between fondue and fonduta; refreshing tomatoes with fontina sauce and cornichon dressing.

A flavorful tandoori salmon; favorite kitchen gadgets under $15; a tasting of yogurt; broiled smashed zucchini with garlicky yogurt.

Fettuccine with caramelized onions, bacon and olives; orange spritz; roast chicken with rosemary and lemon.

A 1960 Ansel Adams Portfolio III: Yosemite Valley; a Persian Qashqai Gabbeh rug circa 1935; 1959 JFK's boxer shorts with signed photo.

Actor Michael Douglas and writer/director Lena Dunham explore their family roots.

Impressionist works, including Monet's lilies, Renoir's ladies, Degas' snapshots and Rodin's statues; tracing the travels of Van Gogh through his art; wild and crazy buildings in Spain.

Touring the exhibits and artifacts of the Safe Haven Museum and Education Center in Oswego, N.Y.

This 30-minute international newscast produced by Japan's national public broadcaster NHK looks at the realities of Asia today. From the diminishing natural coral along the coast of Boracay to the recruitment efforts by The Republic of Korea to find foreign workers to offset its labor shortage and aging population, the documentary series offers in-depth, behind-the-scenes analysis of news and publ

The deaths of two heirs lead to long-lost family secrets.

Alphy and Geordie investigate when a member of a rock band is murdered; Alphy struggles with some family history.

DI Ray turns her focus back to the Chapman family after finding the missing gun.

Blues rock musician Gary Clark Jr. performs highlights from "JPEG Raw"; Black Pumas present selections from "Chronicles of a Diamond.".

Astrid confronts the criminal her father chased before he was murdered.

The deaths of two heirs lead to long-lost family secrets.

Alphy and Geordie investigate when a member of a rock band is murdered; Alphy struggles with some family history.

DI Ray turns her focus back to the Chapman family after finding the missing gun.

Blues rock musician Gary Clark Jr. performs highlights from "JPEG Raw"; Black Pumas present selections from "Chronicles of a Diamond.".

Margaret Hoover leads interviews and debates.

Daniel visits the post office and learns how letters are sorted and mailed, then sends a letter to Dad; Daniel and Dad Tiger surprise Mom with banana bread.

Daniel learns the benefits of doing good deeds.

Sammy and Benito find a way to communicate; Sammy makes plans for his mom's visit.

Alma finds a way for everyone to get books while the library is under renovation; Alma finds a doll in the park.

Arthur's not sure what to make of the new baby; D.W. considers running away to Button Island.

Carl and his friends clean up the Fuzzytown Park; Carl accidentally breaks the birthday present Sheldon planned to give his mom.

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

Margaret Hoover leads interviews and debates.

John Katko strives to bring balance to discussions on divisive political issues.

The Wild Center, a combined zoo-quarium, museum and education center in the Adirondack Mountains.

Samantha Brown explores the emotional heart of travel and the people who change, challenge and strengthen a destination.

The story behind David Attenborough's wildlife documentary series "Life on Earth," which changed his life forever.

Exploring the quantum universe.

Rosamund comes up with a plan to help Edith, but Violet, Edith's gandmother, sees right through it; Isobel is the object of someone's attention, while Mary asks Gillingham for a very big favor.

The Crawleys are implicated in a scandal that threatens to engulf the monarchy. Robert goes to great lengths to protect the royal family, and his own.

Robert and Carson are dismayed when a Labour government comes to power in the general election of 1924; Lady Mary receives another proposal from Tony Gillingham.

Jogging in Hyde Park; British Museum; Victoria and Albert Museum; East End food tour; celebrating London's regeneration.

Sister Veronica weighs her future with the Order; Dr. Turner makes a final stand against the council's news before the maternity home closes; the Mullucks campaign for the rights of all thalidomide victims.

Becca and Rosaline reel from shock and seek solace in different directions as revelations about the circumstances surrounding Mary's death come to light.

Edmond reveals to Villefort that Heloise stole the vial of poison from him, the same poison used to murder the Marquise; Villefort confronts Heloise, threatening to expose her.

Prime Minister Thatcher faces mounting pressure after a key ally's sudden departure; a television appearance becomes a turning point for her political career.

Sister Veronica weighs her future with the Order; Dr. Turner makes a final stand against the council's news before the maternity home closes; the Mullucks campaign for the rights of all thalidomide victims.

Becca and Rosaline reel from shock and seek solace in different directions as revelations about the circumstances surrounding Mary's death come to light.

Edmond reveals to Villefort that Heloise stole the vial of poison from him, the same poison used to murder the Marquise; Villefort confronts Heloise, threatening to expose her.

Astrid confronts the criminal her father chased before he was murdered.

The Wilder Homestead in Malone, N.Y., the boyhood home of Laura Ingalls Wilder's husband Almanzo.

Leg lift; leg cycling; stretching; balance; arm toning.

A workout to strengthen muscles and help the entire lower body become liberated and flexible.

Ronald, a meticulous, rule-following pig, and Roxy, a free-spirited musical hedgehog, explore the "wows" of one of America's most extraordinary places -- Sequoia National Park.

Nature Cat gets his big break when director Quentin Bearantino sees how perfect he is for the role of Cowboy Kitty; Nature Cat and the gang bring Hugo's farm back to life.

Molly must find her mom's plane keys so she can get home in time for Mother's Day; Trini spots a talking white bird.

Prunella receives a Braille copy of a book; Arthur and D.W. watch immature television shows.

Odd Squad must figure out how to control the temperature of two dragon eggs after the power goes out in headquarters.

Martin and Chris try to touch a hummingbird; the brothers utilize hummingbird powers to prevent Gourmand from cooking chocolate-covered hummingbird egg snacks.

As a hurricane approaches, the Hunter kids learn about preparation and safety, moving furniture inside and checking their emergency supplies.

Lyla and Stu help out when the neighborhood garbage truck malfunctions; Lyla and Louisa take a ride on the city bus and accidentally lose Stu.

Sheldon can't wait for Carl to play his favorite beach game; Lotta and her friends search for Lotta's lost blanket.

Daniel and O play post office; Jodi uses things in nature to make a homemade boat.

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

Rudy is afraid of getting a shot at the doctor's office, so Nina and Abby play pretend to show what the visit will be like so he can feel less scared.

The Treeborhood celebrates a parranda; the Wombats try to stay awake on New Year's Eve.

Daniel and O play post office; Jodi uses things in nature to make a homemade boat.

Prunella receives a Braille copy of a book; Arthur and D.W. watch immature television shows.

Exploring Versailles; Vaux-le-Vicomte; Fontainebleau; the glass and statuary of Chartres cathedral.

Tom and Kevin use scrap wood to create an end grain cutting board in Build It; Scott installs surface-mounted downlights in a living room; What Is It?; Roger discusses the best ways to keep mice out of the house.

A 1960 Ansel Adams Portfolio III: Yosemite Valley; a Persian Qashqai Gabbeh rug circa 1935; 1959 JFK's boxer shorts with signed photo.

Installing vinyl siding on the main house and ADU; revealing the ADU's framed layout; reviewing basement HVAC; installing a three-panel slider to connect indoor and outdoor living.

Lawn mowing basics; how to vet and hire a trustworthy contractor to avoid costly mistakes; installing a concrete paver walkway.

Journalists discuss New York state politics and government.

A detailed look into news stories from around the world from the BBC news desk in Washington, D.C.

Coverage from Washington, D.C. and London, with a regular panel of guests from across the political spectrum discussing the biggest stories of the day.

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

A Cartier Art Deco Tutti Frutti clutch circa 1925; a Carl Kauba cowboy bronze circa 1900; a Sumerian cuneiform tablet.

The town of Natchez, Miss., confronts the tension between preservation and truth as it wrestles with race, memory and identity.

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

A Cartier Art Deco Tutti Frutti clutch circa 1925; a Carl Kauba cowboy bronze circa 1900; a Sumerian cuneiform tablet.

The town of Natchez, Miss., confronts the tension between preservation and truth as it wrestles with race, memory and identity.

Exploring the International Motor Racing Research Center at Watkins Glen, a world class library and archive that serves as a destination for hundreds of scholars, journalists, authors and filmmakers from around the globe.

Scissoring the legs back and forth; a pose that tests balance.

An all-standing workout aimed at strengthening the abs and waist; from Playa del Carmen, Mexico.

Elinor and her friends play Hide-and-Go-Seek but are unable to stay hidden from the Goat twins; an owl inspires Elinor's costume for Costume Day.

Brooks the Baltimore oriole flies into Sadie's window; the crew wish there were no more wolves so they can enjoy a day at Mystic Pinecone Park.

Molly faces big obstacles while training for a cross-country ski race; Molly and her family lose their lunch when a seal sneaks onto their boat and steals their food during a fishing trip.

D.W. doesn't want another pet after her bird, Spanky, dies; Buster's too busy to spend any time with Arthur.

Owen and Ohio provide backup on a case, so they can have a pizza party; an unlucky coin is accidentally released to the public.

A Creature Quiz challenge question about the differences between a crocodile and an alligator turns into a Crocogator contest.

Benny's toy penguin is swept away by melting snow, transforming a day of sledding into an urgent rescue mission.

Lyla struggles to sleep and tries to figure out what is wrong with her sleep routine; Lyla tries to do her own hairstyle.

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.

The Tiger Family goes to the restaurant for taco night; Music Man Stan comes to school for a musical story with the class.

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

Reporters Elmo and Abby offer strategies to Nursery Rhyme characters experiencing big feelings of excitement, nervousness and frustration.

The Wombats track down a scary-weird sound that has frightened Carly, CeCe and Clyde; the Wombats become Hopping Helpers for a day.

The Tiger Family goes to the restaurant for taco night; Music Man Stan comes to school for a musical story with the class.

D.W. doesn't want another pet after her bird, Spanky, dies; Buster's too busy to spend any time with Arthur.

Religious tradition in Jerusalem; Tel Aviv; Masada; pilgrims visit biblical sites around the Sea of Galilee; Yad Vashem Holocaust memorial.

Scott helps a homeowner raise and lower a light with a motorized lift; Tom shows Kevin the best uses for a jigsaw and how to choose blades; Roger visits Kentucky to help a homeowner repair his once lush lawn.

An archive of the Oak Ridge Journal; Pete Seeger autographed sign relating to the Peekskill riots of 1949; an 1854 Edward Beyer panoramic oil painting.

New immigrants from China, Japan, and beyond adapt to life in America, building railroads, impressing in Hollywood, and fighting for equality.

The first generation of U.S.-born Asian Americans have their loyalties tested during World War II.

Although heralded as a model minority, bold ambition leads Asian Americans to national political office as a culture-quake simmers beneath the surface.

A detailed look into news stories from around the world from the BBC news desk in Washington, D.C.

Coverage from Washington, D.C. and London, with a regular panel of guests from across the political spectrum discussing the biggest stories of the day.

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

Jamie Chung, Cyndi Lauper and Danny Trejo retrace the journeys of their immigrant ancestors.

Research into the ancestry of singer Lea Salonga and actress Amanda Seyfried reveals relatives who survived heart-wrenching ordeals.

President Trump's unprecedented challenges to the Federal Reserve and what it means for the economy; tracing the battle between Trump and the Fed as the central bank steers the economy through an increasingly precarious moment.

Twenty-four hours a day, the latest national and international stories as they break.

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

Jamie Chung, Cyndi Lauper and Danny Trejo retrace the journeys of their immigrant ancestors.