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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.

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

Simple exercises to relieve a stiff, tense neck.

Liberating joints and muscles in the neck and shoulders.

Ari grows impatient waiting for ketchup; Elinor, Olive and Ari have to figure out how to expand their clubhouse to fit all the new members of The Explorer's Club.

The gang replants their favorite sunflower; after the gang gets lost during a treasure hunt, Nature Cat advises them to follow mossy trees home.

Molly uses Indigenous knowledge to spot a storm.

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

Olive and Otto try to stop zeroes from disappearing; odd things happen to the Bears basketball team.

Martin encounters a lost colony of black-footed ferrets.

Corky is selected to make a presentation at school during a science day celebration, but humidity jeopardizes her project.

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.

Jay and Lupe use wayfinding signs to track down Phoebe; Pete and Craig face an epic hoops battle on the courts.

Rudy feels angry when Abby asks him to share his toys, so his friends make a movie to show that sharing can be fun.

All aboard the Moo Moo Choo Choo; visiting great uncle Duper in the Windborhood; world's biggest whirligig blows away; helping great uncle Duper imagine how to build a new one.

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.

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

Aerial view of Cappadocia; underground city; circumcision party; exploring troglodyte ghost towns; shopping for sheep; the modern capital of Ankara.

Kevin gets a firsthand look at Nick Offerman's woodworking shop; home technology expert Ross Trethewey looks at a new device to track home energy usage in Future House; Richard shows what happens when one uses the wrong soap in the dishwasher.

A Lambert magician automaton circa 1900; Ray Bradbury archive; Fred Myrick scrimshaw tooth circa 1830.

Joyce Barnaby finds a body in Midsomer Florey.

Leonard's drinking lands him in prison overnight, and when he wakes up, the consequences escalate.

As Marlon faces a difficult decision about his future, he's also forced to confront his past when his old boss is murdered, and the only witness is his pet parrot.

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.

The team is confounded by a shocking murder in a hotel elevator.

One of the hottest dance halls in town.

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

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.

The team is confounded by a shocking murder in a hotel elevator.

One of the hottest dance halls in town.

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

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

How to squeeze and stretch built-up tension from the shoulders and upper back.

A revitalizing workout with gentle movements that release tension, calm the nervous system and build strength and flexibility.

The kids try to determine what the weather will be like for Animal Town's parade; Olive gets a bad case of the hiccups.

Nature Cat tries to figure out a way to complete the Outdoor Nature Warrior Challenge and stay cool during a heat wave; the group plays hide-and-seek with Screechy the screech owl.

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.

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

Oscar attends a gathering of Odd Squad scientists called Lab-Con at Odd Squad Academy.

Martin and Chris find out that Zach Varmitech plans to capture a black jaguar.

The kids learn what colors make up a rainbow just in time for a Mother's Day surprise.

Lyla and Luke clean Stu without a bath; Lyla and Ale find a way to protect the callaloo plants from stink bugs.

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

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.

Phoebe and Jay accidentally get paint on the mail and have to decode addresses; Phoebe and Jay find their parents' box of memories.

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

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

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.

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

Touring four castles -- Chenonceau, Chambord, Cheverny and Villandry; feeding hunting dogs; local cuisine; a princely garden.

Tom is in Cincinnati to create a simulated wainscoting out of base cap molding; NASA astronaut Mike Foreman shows off a few space tools; Richard helps a homeowner get enough hot water for his children's bath time.

A Booker T. Washington archive; a 17th-century Chinese transitional wine pot; Eanger Irving Couse painting.

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

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

Vermont filmmaker looks at the story of beavers in Williston, Vermont.

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.

Journalists discuss New York state politics and government.

The story of the American suffragist movement and the friendships, heartbreak and action that brought women together and tore them apart.

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