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Scientists and filmmakers explore the icy waters of Antarctica to observe how killer whales hunt.

New evidence sheds lights on the life and mysterious collapse of Cambodia's ancient jungle city.

Experts combine history, archaeology and forensic investigation into a quest to prove women fought alongside men in Rome's ancient amphitheaters.

Exercises that improve spinal flexibility, wrist strengthening and warming the joints with self-massage; a gentle stretch segment using a large ball to improve overall range of motion.

A full-body flexibility workout in a garden stretches all muscles and promotes movement.

News. Reporting on the day's international news from London and from BBC correspondents around the world.

Aarti Craft turns all the agents in Chicago into paper dolls except for two, Oxford and Osalind, who avoid her powers and join the Mobile Unit to stop Aarti for good.

While investigating exoskeletons, the hercules beetle accidentally gets enlarged.

After a groundhog predicts more winter weather, Benny is convinced he will have snow on his birthday so he plans a snow-filled birthday party.

Lyla and a new friend build a spaceship; Lyla learns her sisters can predict what the other wants, so she tries to do the same with Luke.

Carl and Sheldon are on a thank you mission; Carl shows his friends the right way to play with pet rocks.

Teddy is nervous for a boat ride on Trolley.

The Fuentes kids make a fort in the living room but disagree about what to put in it; Rosie and Javi build a car for a derby race.

After looking at the moon through Yasmine's telescope, Tamir, Elmo and Zoe pretend to be astronauts traveling to the moon.

The Wombats build a Cause and Effect machine; Super's best friend Chanaa pays a visit.

The pals and Trolley try to keep a snow snurdle from melting; Panda invites his pals to a party on Planet Purple.

Gertie helps Pinkalicious find her inner courage when it comes time to learn a new move in karate class; the school experiments with googly eyes.

Elinor finds what she thinks is a fish in the pond, but she and her friends realize it's a tadpole turning into a frog; Elinor, Ari and Olive make up a dance.

Papi is called to rescue a cow on the loose in the Bronx; Lucas gets upset after Alma, Eddie and Lauren copy his new hairstyle.

Xavier travels to meet his heroes Christopher Reeve, Kitty O'Neil, Oprah Winfrey and his great great grandfather.

Exploring Italy's repertoire of simple soups; Italian wedding soup; bread and tomato soup with poached eggs and ribollita; four ways to boost store-bought broth.

Honey-glazed pork shoulder; exploring the world of sheep milk cheese; the Welsh tradition of celebrating the leek; creamy potatoes and leeks.

A new technique in dyeing where the folds allow "glitches" of color to bleed through, creating fascinating intersections of color; little landscapes.

The process of creating French leavers lace, from delicate Chantilly and bold geometric patterns to florals, bridal designs and haute couture styles.

Making accessories from various types of fleece; no-slip wrap; options for seaming and edge finishing.

Author and designer Lindlee Smith breaks down how to sew diamonds and Y-seams.

Experts analyze prominent international affairs topics and America's role in a shifting world.

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.

Pumpkin creme caramel; an entree salad with warm pumpkin wedges and a honey vinaigrette; whole roasted pumpkin stuffed with bread pudding; how to perfectly roast pumpkin seeds.

Jeff and Jamie step in to save a 120-year-old grocery store in the South End, but moving a fragile, historic structure is risky.

People, places and events from all over the state.

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

News. Reporting on the day's international news from London and from BBC correspondents around the world.

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