KETZ-DT

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.

Ground-breaking discoveries; going to extraordinary lengths to save wild canids around the world, from endangered wolves to injured African wilddogs.

An Italian hotel proprietor's autograph book; Margaret Keane "Big Eye" painting; collection of 1936-1939 Edward Weston photographs.

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

Engaging muscles in standing poses, with a focus on Warrior II and Side Angle Pose.

A full body workout strengthens each muscle in the body while targeting the shoulders.

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.

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.

Donkey babysits a baby yodel bird who won't take a nap; Donkey and Panda argue while playing superheroes.

Rosie and Javi get a new book, but it's in a different language; Rosie tries to form a club with her friends.

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.

Alma, Eddie and Junior play a late-night game with Steggie; Alma decides she wants to play piano.

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

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

Martin encounters a lost colony of black-footed ferrets.

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

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

David Attenborough explores London's Natural History Museum and meets creatures from the past, brought to life by CGI, including a giant eagle and colossal snake.

Hunting dogs; camouflage clothing; venison meatballs.

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

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

A ghostly message spells death for a war veteran.

Part 2/2. Londoner Mervin Wilson sinks his teeth into one of the team's most puzzling murder cases -- three men, all unconnected apart from the fact that they are dressed as Santa Claus, are shot with the exact same gun at the exact same time.

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.

An oval scene with warm brown and gold tones that capture a lonely forest river.