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A portrayal of three families confronting the unique challenges of Alzheimer's and how the disease transforms roles and relationships.

Dr. Ayse Coskun, Boston University, and Josh Fluecke of Syska Hennessy Group discuss data centers.

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

The team begins a six month expedition following lions, leopards and cheetahs in the Okavango Delta; a huge wildfire threatens the big cats and the team.

The team follows lions, leopards and cheetahs after a massive wildfire; the dominant male lions fight intruders while leopards and cheetahs struggle to secure their next meal.

Dr. Ayse Coskun, Boston University, and Josh Fluecke of Syska Hennessy Group discuss data centers.

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

Terrifying moments of high danger on the International Space Station, when ingenuity and teamwork keep astronauts alive as they do remarkable science in space.

Investor Francois Rochon, founder of Giverny Capital, goes through the process of finding a select group of high-quality companies with sustainable competitive advantages to hold for the long term.

The six families work on homework assigned by their coaches and use The Opportunity Finder to identify help from nonprofits.

The team begins a six month expedition following lions, leopards and cheetahs in the Okavango Delta; a huge wildfire threatens the big cats and the team.

The team follows lions, leopards and cheetahs after a massive wildfire; the dominant male lions fight intruders while leopards and cheetahs struggle to secure their next meal.

Facial exercises increase sensory awareness in the mouth.

A Vietnamese wet market; making a Filipino dish at Musang in Seattle.

Individual inside-out eggplant parm rollups; an ancient version of hard-boiled eggs; eggs baked in individual cups of ham with a tasty topping.

Glazed pears and shortbread pecan praline; potstickers filled with dried plum and apricots; blind baking a pie crust for pumpkin and apple pies; homemade chocolate peppermint bark.

Zadie must face her fear and go to the barber for a haircut; Malik discovers smart devices have limitations.

Mom helps Daniel be empathetic to someone else's feelings; Daniel helps Chrissie look for her lost bracelet.

Elmo keeps practicing and does not give up until he learns how to play "Twinkle Twinkle Little Star" on his piano.

Panda enjoys a snow day his own way; Bob Dog wants to win at Gameshow Gator's new snowy game.

Roberto Clemente encourages Xavier, Yadina and Brad to help however they can when the museum water fountain breaks on a hot day; Kristi Yamaguchi shows Yadina that it is ok to ask for help when learning how to roller skate.

A heat wave hits Qyah and Molly is determined to find out the highest temperature on record; Molly and Trini must save Qyah from a wildflower.

Lyla overcomes her fear of rock-climbing; a riddle game about everyday objects made by Black inventors.

Rosie is so excited to celebrate Christmas with abuela in Mexico City that she forgets to bring her present.

Rafia and Alma have trouble ice skating; Alma helps Junior find his missing tooth.

Lotta is frustrated learning a new dance, but realizes it is ok to experience music in her own way; Sheldon worries about telling Carl that he doesn't want to play pirates anymore.

Zach Varmitech kidnaps a herd of walruses.

Buster's friends learn he has asthma in "Buster's Breathless"; Halloween pranks run amok in "The Fright Stuff.".

Dot and Al announce the Hunters are spending Christmas in Nigeria, and Corky wonders if she can have a fun Christmas without snow.

The agents are caught in a time loop; a villain sets off a backward bubble.

Enforcing the new law of Prohibition creates problems.

Comics Carol Burnett and Niecy Nash see family mysteries solved by DNA.

In the wake of the crash, Eliza second-guesses herself; Pete and Wayne struggle to separate their personal grievances from the job at hand.

The new uniforms receive their reveal; Cristina learns of Alberto's infidelity, and he learns shocking news of his own; Doña Blanca confronts ghosts from the past.

Susan meets Cecily's sister and husband at the Treherne's hotel and learns more about the hotel's former employee found guilty of murder; in Conway's novel, Pund investigates Melissa James' murder and learns about possible suspects.

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

The ins and outs and pros and cons of cruising, including making smart use of limited time on shore and the congestion and commercialism that comes with mass tourism.

In the wake of the crash, Eliza second-guesses herself; Pete and Wayne struggle to separate their personal grievances from the job at hand.

Susan meets Cecily's sister and husband at the Treherne's hotel and learns more about the hotel's former employee found guilty of murder; in Conway's novel, Pund investigates Melissa James' murder and learns about possible suspects.

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

Comics Carol Burnett and Niecy Nash see family mysteries solved by DNA.

Gender selection in babies in Northern Cyprus; dogs help Ukraine war victims; integration in Boostedt; a dolphin Venice's lagoon.

English-speaking visitors travel the length of Japan, exploring the local culture, meeting the people and offering travel hints rarely found in guidebooks.

Terrifying moments of high danger on the International Space Station, when ingenuity and teamwork keep astronauts alive as they do remarkable science in space.

Fifty years after humans first stepped foot on the moon, engineers, scientists and entrepreneurs engage in new discoveries to make life on the moon a reality.

Full body workout set to country music.

Jenn visits a Rhode Island sod farm to see what sustainable grass alternatives they've been experimenting with; Tom and Kevin discuss the most common types of nailhead and shank designs; Heath brightens up a dark driveway.

Japanese food available at Tokyo's iconic market, from seafood to produce.

Hosts Yu Hayami and Patrick Harlan, with the help of Japanese chefs Tatsuo Saito and Rika Yukimasa, introduce Americans to the techniques, ingredients and harmony of Japanese cuisine.

Devonte J. Squirrel moves to the Treeborhood; Devonte and the Wombats create a machine that makes ice cream using a bike.

Daniel and Prince Wednesday are afraid to go sledding when they see the hill's height; Daniel dances in "The Nutcracker Ballet.".

It's Opposite Day on Sesame Street and everyone's doing things that are as different as they can be; Bert and Ernie notice that everyone's having fun doing opposites and realize they like so many opposite things too.

"The Hanukkah Problem" and "The Christmas Problem.".

Molly rushes to find a new gift for her new friend, Kevin; Grandpa Nat's new drone is swept away by a dust devil.

Lyla and Everett play basketball against their moms; Lyla and Luke restore their old toy car to make it special for Stu.

Rosie and Javi transport a watermelon to the park for the family picnic; Rosie builds a dino cave for Iggy.

Alma tells on Emi when she's doing something dangerous; Alma's friends won't try Aaron and Lucas' snacks.

Carl and Nico argue over who gets Arugula as their magician's assistant; Sheldon tries to help Carl become a good listener.

While searching for smallmouth and largemouth bass, Zach Varmitech challenges Martin and Chris to a fishing contest.

Mr. Ratburn isn't acting like himself, which has Arthur, Buster and Brain worried; Mr. Crosswire gets a robot butler for Father's Day.

The Hunters investigate a weather mystery surrounding massive rocks that move on their own in the desert.

Agents and the maintenance workers switch jobs for a day; the agents get trapped in a computer.

General Howe takes Philadelphia, but the Americans' surprising victory over General Burgoyne at Saratoga encourages France to support the U.S.

The French-American alliance changes the war and moves it to other theaters; navies battle off England and in the Caribbean, while armies advance in Indian Country and the South; the British take Charleston.

British General Cornwallis struggles to pacify the southern states; supported by the French, a victory at Yorktown secures independence for the Americans.

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

Mysterious tombs, megaliths and cave paintings emerge from the Stone Age; Egyptians and Greeks lay the foundation of Western art, creating a world of gods, pyramids, temples and lifelike statues.

Enforcing the new law of Prohibition creates problems.

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

The making of the documentary series "Country Music" by Ken Burns, which details the history of country music in America; host Kathy Mattea.

Enforcing the new law of Prohibition creates problems.

Exercising finger joints.

Kevin visits a high school carpentry program that's helping the community; meeting with an electrician in North Asheville; Tommy helps homeowner Paula turn an antique chest into a bathroom vanity.

Jeff and Jamie head to Atlanta to help Jamie's brother open his own restaurant.

Freezers; transforming Mexican takeout into frozen burritos; frozen vs. canned; upside-down turkey veggie rice bowls; Picard frozen food store.

King Friday makes Daniel king for the day, and he learns that the most important part of the job is to be kind to his neighbors.

Sesame Street's Feelings Fair has games, crafts and food that are all about feelings; Elmo, Alan and Julia learn about feelings by looking at their friends' facial expressions.

Donkey and Panda save Rockstar Penguin's show when her band can't come; the pals help Turtle-Lou deliver packages.

Madam C.J. Walker shows Xavier that working hard on his lemonade stand can help him afford the pogo stick of his dreams; Edwin Binney shows Xavier, Yadina and Brad that to work together as a team, they should listen to everyone's ideas.

Molly's camera breaks while she and Grandpa Nat are observing an active volcano; Molly and Tooey plan a bird-watching trip to celebrate winter solstice and Trini's birthday.

Lyla and her family must figure out a way to get Stu back home when he gets lost delivering cookies.

Rosie tries to make a snowy winter in the backyard for Mom; Lote falls in the river during a hike in a national park.

Alma must learn a new way to celebrate when her family's Noche Buena traditions don't go as planned; Alma decides to make a do-over gift for Junior.

Carl surprises Sheldon with a lemonade stand, but is confused when Sheldon runs off; Carl's caterpillars turn into butterflies.

The brothers get swept up in the planktonic lifestyle when they go on a mission to understand the foundation of life in the ocean.

Arthur and his family prepare gifts and parties to celebrate Christmas, Hanukkah, Kwanzaa and Baxter Day.

The agents are caught in a time loop; a villain sets off a backward bubble.

Comics Carol Burnett and Niecy Nash see family mysteries solved by DNA.

The families discuss their dreams, meet with resources in their community and continue their progress to become more financially resilient.

Pacific Northwest resident and retired astronaut Bill Anders recounts his role in the 1968 Apollo 8 mission to the moon, and its significance leading up to the moon landing.

An avant-garde play is being read and during the reading, the playwright is murdered. However, the murder is not as easily solved as one might think.

The team reinvestigate the disappearance of two young political activists who had waged a very public campaign against racist comedian Ray Harris.