W41DI-D

The decades-long scientific quest that led to a life-saving treatment for cystic fibrosis.

Tracking how the polar world is transforming, from scaling jagged peaks to descending deep into the ice sheet.

John arrives in Raleigh to discover how the recent influx of Latinos from Mexico, Venezuela and beyond is changing the Old South to a Nuevo South.

John visits one of America's oldest and most charming cities to discover how Latinos have been influencing it since the get-go.

Traveling the New Mexico and Chihuahua border region; architect Ronald Rael; observing migratory species; visiting a remote Mennonite camp.

The life and work of photographer and historian Harry Crosby, whose travels resulted in five books documenting the people, culture and natural scenery of Mexico's Baja California peninsula.

Coahuila style barbacoa on pita bread; yogurt and cucumber salad with herbs; red salsa from the Jacalito; agave empanadas with pecans and pine nuts.

Green curry and coconut creamed collards; collard salad with bacon dressing; exploring a range of collard varieties; collard sandwiches.

John arrives in Raleigh to discover how the recent influx of Latinos from Mexico, Venezuela and beyond is changing the Old South to a Nuevo South.

John visits Denver, the "Mile High City," to discover how the Latino community is working to reclaim its heritage and teach the new generations all about the importance of their culture.

Traveling the New Mexico and Chihuahua border region; architect Ronald Rael; observing migratory species; visiting a remote Mennonite camp.

The life and work of photographer and historian Harry Crosby, whose travels resulted in five books documenting the people, culture and natural scenery of Mexico's Baja California peninsula.

Green curry and coconut creamed collards; collard salad with bacon dressing; exploring a range of collard varieties; collard sandwiches.

The family stories of political organizer Donna Brazile, actor Ty Burrell and artist Kara Walker.

A police detective persuades Professor T to help her investigate a serial rapist; T makes a momentous decision when he finds out his mother is trying to sell his family home.

Professor T is called in to narrow down the list of possible suspects after a librarian is poisoned, but not everyone on the police team is happy with his involvement.

Professor T deals with a hostage situation; old flame Christina reveals that not all is well with her marriage.

Professor T helps investigate the disappearance of a 6-year-old girl; tensions rise between Paul Rabbit and Professor T.

Professor T is convinced a vulnerable girl is the key witness to a murder; Dan and Lisa agree to go on a date.

Professor T believes the culprit who made an attempt on a businessman's life may be closer to home than the police suspect; Professor T's birthday brings with it a haunting childhood memory.

A police detective persuades Professor T to help her investigate a serial rapist; T makes a momentous decision when he finds out his mother is trying to sell his family home.

Professor T is called in to narrow down the list of possible suspects after a librarian is poisoned, but not everyone on the police team is happy with his involvement.

Professor T deals with a hostage situation; old flame Christina reveals that not all is well with her marriage.

Professor T helps investigate the disappearance of a 6-year-old girl; tensions rise between Paul Rabbit and Professor T.

Professor T is convinced a vulnerable girl is the key witness to a murder; Dan and Lisa agree to go on a date.

Professor T believes the culprit who made an attempt on a businessman's life may be closer to home than the police suspect; Professor T's birthday brings with it a haunting childhood memory.

A flood brings new challenges for the big cats; for the first time, the lion cubs experience water and the danger it brings.

How cultural traditions have led to remarkable innovations, from navigating the featureless Arctic to building energy-efficient homes in the desert.

Exploring the importance of the polar seas as polar oceans warm and sea ice disappears.

Finds include an 1895 UNC football, an 1856 Chinese export Canton fire oil painting and a Jacob Hurd silver cann circa 1745.

The castle transforms into a magical winter wonderland as the team wrestles their biggest-ever tree; butler Luis has a merry time hosting a festive cocktail master class.

Inspired by her passion for books, Mel Giedroyc travels with her friend Martin Clunes to explore scenery and locations popularized by British novels and films.

People, places and events from all over the state.

When a man is killed at her university reunion, Becks finds herself on the wrong side of an investigation.

As Eliot's health deteriorates, he accuses his family of murder; Atticus Pund closes in on his prime suspect.

Cushla and Michael begin a secret relationship that changes everything; as violence and scrutiny close in, Cushla is forced to risk everything for a love that defies the divide.

Secrets of the Tower of London, and stories of the traitors, rebels and royalty who met their end at the site.

Tracing the artistic influences of the historic Thousand Islands Playhouse on every aspect of local life.

Ketchikan is home to temperate rainforests and Misty Fjords accessible only by boat and air; Alaska's Panhandle preserves vast tracts of the planet's dwindling temperate rain forests.

Uncovering the lasting impact of ragtime composer Scott Joplin on today's orchestras; a restaging of Joplin's magnum opus "Treemonisha" for the 21st century.

Hundreds of diverse choral groups from all 50 states perform a new work in celebration of the 250th anniversary of the signing of the Declaration of Independence.

Bruce Springsteen talks about his career, legacy, America 250 and the opening of the Bruce Springsteen Center for American Music at Monmouth University.

Jeff Tweedy, founding member and frontman of Wilco.

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

Following the path of the Protestant Reformation; Luther500 Festival in Wittenberg, Germany.

The family stories of political organizer Donna Brazile, actor Ty Burrell and artist Kara Walker.

Finds include an 1895 UNC football, an 1856 Chinese export Canton fire oil painting and a Jacob Hurd silver cann circa 1745.

An 1864 Lincoln campaign poster; a Dirk Van Erp lamp; Marion Kavanaugh Wachtel oil.

The castle transforms into a magical winter wonderland as the team wrestles their biggest-ever tree; butler Luis has a merry time hosting a festive cocktail master class.

Inspired by her passion for books, Mel Giedroyc travels with her friend Martin Clunes to explore scenery and locations popularized by British novels and films.

In the forests of Chiapas, archaeologists are uncovering the millennia-old works of the Lacandones.

Cruising the Shannon River from Enniskillen in Northern Ireland to Portumna in the Republic of Ireland; celebrating Irish culture, art, food and music.

Dubrovnik on the Adriatic Sea coast; Mostar, Bosnia and Herzegovina; Montenegro's Bay of Kotor.

Why Christiansborg Palace, Amalienborg Palace and Rosenborg Castle are in the same small country; Nyhavn; why Shakespeare used Kronborg Castle for the setting of "Hamlet.".

As Judith and Suzie work with the police to find the killer, tensions rise among Becks' friends in the house.

The murderer in Corfu claims another victim; Eliot's condition worsens and Susan unexpectedly finds herself a suspect in a murder case.

Cushla's relationship with Michael deepens, despite growing tensions at home and school; Gina's drinking worsens, and family pressure mounts; Cushla learns unsettling truths about Michael's past, but passion and tenderness draw them back together.

The family stories of political organizer Donna Brazile, actor Ty Burrell and artist Kara Walker.

Vintage finds include a Gibson style H-2 mandola circa 1918, a Tiffany Studios Daffodil lamp circa 1906 and an 1852 Lincoln manuscript.

The castle transforms into a magical winter wonderland as the team wrestles their biggest-ever tree; butler Luis has a merry time hosting a festive cocktail master class.

Inspired by her passion for books, Mel Giedroyc travels with her friend Martin Clunes to explore scenery and locations popularized by British novels and films.

Afro-Brazilian culture and spirituality thrive after centuries of brutal subjugation.

Towering peaks and vast valleys hold the stories of ranchers, adventurers and families in Grand County, Colorado.

Tracing the artistic influences of the historic Thousand Islands Playhouse on every aspect of local life.

Dubrovnik on the Adriatic Sea coast; Mostar, Bosnia and Herzegovina; Montenegro's Bay of Kotor.

Viking ships; Opera House, World War II tales; Norwegian art.

Damien McGeehan and Shauna Mullin perform in Donegal Castle; Hanna Hats; exploring Studio Donegal; Ardara Distillery; the Henry Girls.

A flood brings new challenges for the big cats; for the first time, the lion cubs experience water and the danger it brings.

How cultural traditions have led to remarkable innovations, from navigating the featureless Arctic to building energy-efficient homes in the desert.

Exploring the importance of the polar seas as polar oceans warm and sea ice disappears.

The consequences of global warming on the oceans and the life they support.

How science, nature and tradition can help the world prepare for the future.

Tracing the artistic influences of the historic Thousand Islands Playhouse on every aspect of local life.

Damien McGeehan and Shauna Mullin perform in Donegal Castle; Hanna Hats; exploring Studio Donegal; Ardara Distillery; the Henry Girls.

Jerusalem; harvesting olives near Ramallah; pilgrimage to Bethlehem; Abraham's tomb in Hebron.

Dalmatian Coast; hiking through Plitvice Lakes National Park; Zagreb; Istrian Peninsula.

The people, places and scenery of favorite "America's Heartland" destinations.

Ketchikan is home to temperate rainforests and Misty Fjords accessible only by boat and air; Alaska's Panhandle preserves vast tracts of the planet's dwindling temperate rain forests.

Uncovering the lasting impact of ragtime composer Scott Joplin on today's orchestras; a restaging of Joplin's magnum opus "Treemonisha" for the 21st century.

Hundreds of diverse choral groups from all 50 states perform a new work in celebration of the 250th anniversary of the signing of the Declaration of Independence.

Bruce Springsteen talks about his career, legacy, America 250 and the opening of the Bruce Springsteen Center for American Music at Monmouth University.

Katie creates an interactive paint-by-flowers installation for the Slow Flowers Summit.

Lemon-braised chicken with pearl couscous, artichokes and chickpeas; dish soap; the power of evaporative cooling; fattet hummus (crispy pita with garlicky yogurt and chickpeas).

Pueblan pork tacos with chipotle and yogurt sauces; favorite ice cream scoops; mini chocoflanes.

The Alhambra, a palace and fortress complex located in Grenada, Spain, is one of the most famous monuments of Islamic architecture.

The culture, cuisine, history and natural wonders of southern Spain's major cities, including Seville, Córdoba and Granada.

Warwick Castle's walls echo with tales of betrayal, bloodshed and murder.

Rose Island Lighthouse; the hidden history of God's Little Acre, a Colonial-era cemetery; Cliff Walk; touring Marble House; harvesting clams.

Cruising the Shannon River from Enniskillen in Northern Ireland to Portumna in the Republic of Ireland; celebrating Irish culture, art, food and music.

Two of Alaska's national parks -- Lake Clark and Katmai -- each have a history of volcanic activity.

Uncovering the lasting impact of ragtime composer Scott Joplin on today's orchestras; a restaging of Joplin's magnum opus "Treemonisha" for the 21st century.