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

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.

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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.

Author Lauren Groveman makes European ethnic specialties, including pumpernickel loaves and crunchy matzos.

Installing a warm roof; new framing poses plumbing challenges; rot is discovered on the original sill; exploring options to light the new ell.

Examples of resistance, survival and revival are revealed through horse-mounted Comanche warriors, secret messages in an Aztec manuscript and a grass bridge in the Andes.

Reconstructing the royal wedding of Queen Victoria and Prince Albert, including the stories behind the dress, food and music.

A reconstruction of Queen Victoria and Prince Albert's royal wedding, including the wedding breakfast.

A 1954 Marilyn Monroe tissue with a soldier's letter; Paul Revere pottery vases; a 1942 Ted Williams game-worn Red Sox jersey.

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

Removing and saving the kitchen cabinets for reuse; tackling the chimney teardown; foundation plans.

Upgrading a home to a solar-assisted split heat pump water heater; three common houseplant pests and simple tricks to banish them; installing an attic ladder.

A treasure hunt brings Moses back to London to sell a priceless diamond; Clarence is determined to prove he is as good as his predecessor.

There's excitement in the air when a film crew arrive at Archangel Lane, until an extra drops dead after eating poisoned chocolates meant for one of the cast.

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