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A Cartier sapphire pendant circa 1915; a 1963 C.F. Martin D-28 guitar and case; a Paul Revere Jr. silver pitcher and diary circa 1775.

An emerald, diamond and gold necklace circa 1875; New Orleans Jazz & Heritage Festival posters; a 1962-1966 Stewart "Smokey" Stover collection.

The story of how Frederick Douglass, a man born into slavery, became one of the most prominent statesmen and influential voices for democracy in American history.

The kids learn how a lever can help them move a big rock in the backyard; Sally plays a song on an instrument, but can't seem to find the right note.

WordGirl and TJ become glued together; it's Becky's turn to take care of the class pet -- a tarantula named Shaggy.

Woofster becomes distracted at the Storybrook Village talent show.

Mindy and Carrot are launched into space when Carrot accidentally pushes a wrong button on the wagon's new control panel; Dr. Skelley presents the first edition of Commander Cressida comics.

The president of the United States calls on Peg and Cat to investigate when strange signals come in from outer space.

Woofster becomes distracted at the Storybrook Village talent show.

Fern gets a cell phone; Brain does not want everyone to know that he was held back in kindergarten.

The agents track down missing monuments; the agents must determine who the real Oswald is.

Martin and Chris take Jimmy to a swimming tutor -- a sea otter named Coach.

The Hunters try to help an injured bird so it can join its friends migrating south for the winter.

Lyla and Luke clean Stu without a bath; Lyla and Ale find a way to protect the callaloo plants from stink bugs.

Forrest can't wait to try everything at the Fuzzytown Friends Picnic, but gets into trouble when he is unable to wait his turn; Carl hosts a Super Blue Moon Sleepover.

Lauren Groveman makes bagels, matzos, pumpernickel bread.

Tommy shows Kevin the careful process of installing rafters for a cantilevered roof; Richard solves a venting problem for the kitchen sink before tackling the AC ductwork puzzle; Tommy and Kevin install snow cleats on the roof.

Viewing Earth's kaleidoscope of colors, including swirls of turquoise phytoplankton, China's blooming yellow flowers, and the night waters near Argentina that are spotted with green lights.

Tracing the family trees of talk show host Sara Haines and playwright Tracy Letts.

Broiled chicken with gravy; toaster ovens; toaster oven gear; skillet roasted broccoli.

Miso-gochujang pulled pork; miso-ginger dressing; roasted cauliflower with miso glaze.

An Asscher-cut diamond ring; a Maynard Dixon painting; a San Francisco Seals-signed baseball.

Why the Scottish kings lived in Edinburgh; why Edinburgh Castle was built high on the Castle Rock; the connection between Edinburgh and Harry Potter; Edinburgh's Royal Mile; Arthur.

New Hampshire's Strawbery Banke Museum; Great Meredith Rotary Ice Fishing Derby; the Harris Hill Ski Jump in Brattleboro Vt.

How animal parents deal with freshwater's constant changes as they raise the next generation; a frog dad scales giant trees with his tadpoles on his back; an elephant mom must choose between safety and the quest for food and water.

Exploring the origins of mammals, long before the age of dinosaurs, and how early ancestors survived global catastrophes and defied extinction to evolve into the vast array of mammals we know today.

Computer scientist Brent Seales attempts to read inside hundreds of carbonized ancient scrolls found at the archaeological site of Herculaneum in Italy.

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

Tracing the 1960s "Grand Alliance" of Black and Jewish communities in the fight for civil rights, highlighting activism, collaboration and the tensions that tested their solidarity.

Investigating the fall of Nicolás Maduro, the legacy of corruption, challenges to democracy and Venezuela's conflict with the U.S.

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

Exploring the family trees of musicians Lizzo and Flea.

Tracing the 1960s "Grand Alliance" of Black and Jewish communities in the fight for civil rights, highlighting activism, collaboration and the tensions that tested their solidarity.

Investigating the fall of Nicolás Maduro, the legacy of corruption, challenges to democracy and Venezuela's conflict with the U.S.

Sally can't stay hidden for long during a game of hide-and-seek; Sally loses her special bead in the sandbox.

It's Becky's turn to take care of the class pet -- a tarantula; Dr. Two-Brains freezes time to preserve his vault of cheese.

Woofster wants to play a game with Whyatt and Princess, but they can't figure out what he wants to play.

Mindy asks Jet and the others to help her keep the sun from going down; Sean portrays Galileo for a school report.

Big Dog is too big to play Little Red on Peg's stage; baby sitters Peg and Cat must figure out how to use a giant beeper.

Woofster wants to play a game with Whyatt and Princess, but they can't figure out what he wants to play.

Muffy worries she is no longer needed when her friends plan a successful bake sale without her; Arthur stands up for Mrs. MacGrady.

The agents are called upon when a lost Baby Laser Chicken is found in the Austrian countryside; clocks stop working when the Odd Squad Timekeeper is struck with oddness.

Learn about the world of chameleons.

The Hunters learn how temperatures can affect outdoor plants and gardens.

Lyla, Everett and her sisters build makeshift carnival games for their brother, Luke, using household and recycled materials; Louisa seeks help to create a special beat for her school presentation.

Arugula and Carl go on an adventure as archaeologists; Carl spots a UFO on Mother's Day.

Pastry chef Mary Bergin prepares a chocolate cake with creme brulee and a nectarine upside-down chiffon cake.

Mark rebuilds a century old Puddingstone wall; Tommy and Kevin revisit the 2005 Cambridge modern project; Heath Eastman installs trimless LED recessed lights; large tanks are installed under the driveway for rain water runoff.

Viewing the shapes that cover the earth's surface from space; the Australian Outback is covered in pale spots due to wombats and elephants.

How animal parents deal with freshwater's constant changes as they raise the next generation; a frog dad scales giant trees with his tadpoles on his back; an elephant mom must choose between safety and the quest for food and water.

Upside-down tomato tart; buying tomatoes; the Leidenfrost Effect; hearty Greek salad.

Chef Fabio Berti; travel writer Matt Goulding; simple and creamy pasta with zucchini, pancetta and saffron; bolognese-style pork cutlets, covered in prosciutto, topped with parmesan and served with a bright lemon butter sauce.

Minnesota items first appraised in 2004 include one whose value is at its highest ever at $2-3 million.

Exploring Bologna's Piazza Maggiore, hidden canals and walking the portico to the San Luca sanctuary; shopping the Quadrilatero; a historic cutlery shop; a twins-run leather boutique.

Exploring Panama, from ziplining above a Panama City skyscraper to fishing off the coast of Punta Chame; meeting highly skilled local craftsmen; taking a wooden boat trip to dance with the Indigenous Embera in their village.

People and organizations creating unique solutions to rural America's toughest challenges, and how these collaborators are inspiring empathy and action to transform communities across the nation.

Explore the importance of plants to our waterways! Learn about plants for bog gardens with the Albemarle Garden Club. Then visit a VU research site on the James River studying riparian buffers and wetlands restoration.

Foyle investigates the death of a girl in a munitions factory, but when a second woman is found murdered, Foyle suspects the deaths are related; the second victim is identified as Sergeant Milner's estranged wife Jane, which makes him a suspect.

The short film "Shady Grove Farm U.P.".

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

This long-running, award-winning documentary series focuses on science, its many applications, speculation, history and researchers. Inspired by the BBC documentary program "Horizons, " the U.S. series frequently features interviews with scientists directly involved in the topic at hand, and sometimes even boasts footage of a particular discovery.

What happened to Wolfgang Mozart's older sister and collaborator, Maria Anna, a musical prodigy in her own right.

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

From an orca mother teaching her young to hunt blue whales to a Banggai cardinalfish protecting his young inside his mouth, ocean parents master dedication and intelligence to raise their young.

This long-running, award-winning documentary series focuses on science, its many applications, speculation, history and researchers. Inspired by the BBC documentary program "Horizons, " the U.S. series frequently features interviews with scientists directly involved in the topic at hand, and sometimes even boasts footage of a particular discovery.

What happened to Wolfgang Mozart's older sister and collaborator, Maria Anna, a musical prodigy in her own right.

Nick's magic trick causes his toy car to disappear under the porch.

Determined to help anyone who needs it, Tim Botsford becomes the Neighborhood Assistant; Nocan the Contrarian schemes to steal items from the debate club's bake sale.

Whyatt wants to meet his hero, Super Puppy.

The children discover that there is a planet with three suns in their solar neighborhood.

Baby Peg tells mom she wants a stray kitty for her pet and problem-solving partner; Peg and Cat scramble to make valentines.

Whyatt wants to meet his hero, Super Puppy.

Arthur, D.W. and Buster build sand castles at the beach; Buster goes out of his way to avoid germs.

The team rescues a long-forgotten agent; Agent Orlando and the Mobile Unit solve a case.

Martin and Chris search for a creature with good hiding powers -- the stingray -- for a game of Creature Hide and Seek.

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 struggles to sleep and tries to figure out what is wrong with her sleep routine; Lyla tries to do her own hairstyle.

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

Steve Sullivan prepares walnut bread; decorative loaves.

Kevin travels to the Midwest to see the manufacturing of plate glass and windows; back in Brookline, Mauro teaches Kevin some cold weather painting tricks; radiant heat is installed under the driveway, while the patio is installed in the front.

Cameras in space show Earth to be a changing, fragile planet, with disappearing forests and melting glaciers.

Fresh peach pie with all-butter lattice top; sugar.

Making beans with chef Eduardo García Guzmán; tortilla soup; Mexican stewed beans with salsa fresca; Mexican sweet corn cake.

An emerald, diamond and gold necklace circa 1875; New Orleans Jazz & Heritage Festival posters; a 1962-1966 Stewart "Smokey" Stover collection.

Turquoise serves as the gemstone of choice for jewelers of the Southwest.

A journey around the South Island of New Zealand by rail.

As Alan Conway is buried, Susan Ryeland gets help from an unexpected source.

Ridley makes a shocking connection between a murder case and the arson attack which killed his family.

Ellinor Seerup's plans for the hotel take hold and everyone turns their anger towards Madsen; Weyse tries to back out of the deal with the theatre.

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

Eliza investigates a foreign ambassador's death while partnering with a woman whose intellect and power mirror her own.