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Scientists, citizens and activists restore the environment thanks to a new understanding of nature.

Why restoring nature may be the best hope for fighting climate change and slowing down global warming.

Battling for dominion over the river with crocs; catching glimpses of an ultra-rare mangrove snake and an endangered nabarlek wallaby; humpback whale mothers raise their calves in the ocean; false killer whales.

The history of unique American horse breeds, including the mustang, Appaloosa, Morgan and quarter horse, that helped shape the nation and the people who continue the tradition of caring for them.

A team of archaeologists researches the "desert kites," the stone megastructures across northern Saudi Arabia and southern Jordan.

Muffy learns about her great-great-grandmother; Arthur doubts a decision he makes during a baseball game.

Odd infestations send Ms. O from her office; Ms O. needs help tracking down her old partner.

The brothers are trapped when their submarine loses power.

As a hurricane approaches, the Hunter kids learn about preparation and safety, moving furniture inside and checking their emergency supplies.

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

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

Chrissie encourages Daniel to ride a horse; Margaret gets scared when fireflies crash the family picnic.

Phoebe and Jay learn how to sort items; Phoebe and Jay learn how to make food labels, so everyone can participate in the potluck.

While Abby and Elmo work together to find a lost Bubble Bug, Grover and Cookie Monster stay behind to take care of the fairy garden's magical beasties.

The Wombats lose Snout while helping Mr. E wrap boxes; Snout sends a postcard to Zeke.

Donkey wants to make Grampy a surprise birthday breakfast, but none of her flapjacks will fly; Panda's toy pickle gets stuck between two rocks.

Rosie, Crystal and Iggy try to recreate Mom and Papá's beach anniversary tradition at home; it's Chiles en Nogada Day, but when Papá loses the recipe, it's up to Rosie to figure out who else might have it.

Elinor and her dad learn how to make their own chocolate; after accidentally breaking a jade plant, the kids learn how the plant grows.

Alma tries to help Mami fix the mofongo; Alma takes her sports rivalry with Eddie too far.

Molly and Tooey are confused when Trini refuses to join the basketball team because of polar bears; Molly's trip north to surprise Nina for her birthday is jeopardized by a moose blocking the runway.

Helen Keller teaches Yadina that there are many different ways to learn; Alexander Graham Bell shows Xavier and Yadina how to help Brad after he loses his voice.

While Abby and Elmo work together to find a lost Bubble Bug, Grover and Cookie Monster stay behind to take care of the fairy garden's magical beasties.

Chrissie encourages Daniel to ride a horse; Margaret gets scared when fireflies crash the family picnic.

An 1857 Queen's Cup Ascot race trophy; a 1956 Curta calculator type II; an art deco sapphire and platinum ring.

Porridge with pinnekjøtt, a holiday dish made with salted and dried goat ribs and served with almond potatoes; pork ribs cooked twice.

Advocates from Nuñez Community College and CRCL work to restore wild habitats; monitoring cypress trees on the Violet Canal; roasted quail with figs and garlic sauce; Drago's blackened gator tacos; blackened gator macaroni and cheese.

Michael Palin embarks on the second part of his journey across North Korea; he sees the Arch of Reunification, which symbolizes the desire to unite North and South Korea; Michael visits the sacred Mount Paektu before returning to Pyongyang.

A woman searches for a man who may have saved her father's life during the Korean War; author of a lesbian autobiography.

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

A panel of journalists provides reporting and analysis of the major stories emanating from the United States capital in this award-winning series. It first aired in 1967, making it the longest-running prime-time news and public affairs program on television.

President George H.W. Bush's role as leader of the first Gulf War, through the final days of his presidency.

The Navy's new warship USS Omaha, Tom Osborne recounts his early coaching days, a retired minister restores antique pump organs.

Kevin meets with an audiologist to discuss the importance of hearing protection; Richard, Nathan and Heath team up to help a couple age in place by relocating their washer and dryer to the main floor.

Twenty-four hours a day, the latest national and international stories as they break.

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

President George H.W. Bush's role as leader of the first Gulf War, through the final days of his presidency.

A look at the documentary series by Ken Burns that illustrates how the American Revolution came to life.

The Mississippi River stretches far beyond the Deep South, into nearly half of the United States.

A team in Dubai attempts to build a multimillion dollar floating home that sits above and below the water.

The evolving meaning of the Statue of Liberty and how it embodies values and conflicts in America, from abolition to the treatment of refugees.

Reassuring children about arguments; Mr. McFeely shares wedding memories.

Buster comes home from his world travels; a musical moose sums up Buster's concerns about fitting it.

Issues concerning the Omaha community.

Social, political and economic trends of American agriculture.

Agricultural business decisions.

A Utah cattle drive; a Colorado female rancher works with environmentalists; cowboy life out on the range.

Ron and friends embark on a cross country skiing adventure that includes 1,000 feet of incline, an overnight camp in below zero temps and numerous spills and wipeouts in La Ronge, Saskatchewan.

A grand tour of the Jeep Grand Cherokee; Hyundai Palisade; Subaru Impreza throwback request.

Mark meets with a local mason to investigate the depth of damage caused to a chimney by fallen trees; siding starts to go up at Paula's; Kevin meets with Army Corp to discuss their continued relief efforts.

Removing ring stains from a wood table; breaking down the types of soil and fertilizer needed for common indoor plants; repairing a brick floor's crumbling mortar using spot pointing rather than a full repoint job.

Panel of experts answer lawn & garden questions.

Smoked fish tacos, a Southern California classic; chimney starters; grilled steak fajitas.

Venison pastrami; O'Neil's Quality Foods delivers finished venison cuts.

Baked salted salmon with dill served with quick-pickled cucumbers; acorn squash with browned butter-orange vinaigrette; smashed potatoes with chili-lemon vinaigrette; Vieux Carré, a herbal cocktail from New Orleans.

Roasted bone-in chicken breasts; kitchen trash cans; baked potatoes.

Handling peppered cotton, a shot cotton fabric with a distinct warp and weave; the correct way to attach long strips to prevent waviness.

Cindy Vance offers ideas on how to create high-end items with everyday materials.

A waterfall by moonlight on a black canvas.

Using acrylics to capture the monarch butterfly as it rests on a flowering butterfly bush.

The Ring Road -- the 800-mile loop around Iceland on Highway 1; the geothermal hot zone of Lake Mývatn; the rugged Eastfjords; glacier lagoons of the Southeast; waterfalls and beaches of the South Coast; puffins at the Westman Islands.

A boat ride to the remote island of Cayo Costa; Cabbage Key co-owner Rob Wells; touring Edison and Ford Winter Estates; ECHO Global Farm; the artist community of Matlacha; touring J.N. Ding Darling National Wildlife Refuge; Sanibel Community House.

Travel writer Jonathan Thompson sets out to explore the adventurous sides of Whistler, Canada and Lexington, Kentucky.

In Swannanoa, Kevin helps Jim's brother Bill tile a bathroom; father and son roofers JD and Jayden; removing rot and replacing the damaged area of Paula's deck.

Kevin meets with an audiologist to discuss the importance of hearing protection; Richard, Nathan and Heath team up to help a couple age in place by relocating their washer and dryer to the main floor.

Old-fashioned, melodic music.

One of the lead actors of a local amateur theater show is murdered by one of the other performers.

Alistair (Philip Bretherton) has specific instructions for Lionel (Geoffrey Palmer) to follow about his public image.

Hyacinth is appalled when she sees a strange man who has obviously spent the night at Liz's.

Daisy gets her hands dirty with Tippy and Gus; Louis gets more insight from Hilary than he bargained for; Daisy and Louis hope to ease their financial woes with a visit to the bank.

The band Exile performs at the Renfro Valley Entertainment Center in Mt. Vernon, Ky., in celebration of its 60th anniversary.

Colombian musician Juanes performs a career-spanning set that includes songs from "Vida Cotidiana.".