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

Animal parents balance risk and reward to raise their young in grasslands; wild dogs must control their teen pups for survival; an expecting langur learns parenting skills by babysitting.

Scientists conduct the largest animal communication study in history to see if innovative word buttons truly enable dogs to talk.

Professor Mark Horton takes a journey across Britain to prove real events and places inspired the chivalric myths of King Arthur and the court of Camelot.

Sign off.

Carl and his pals are excited about trick-or-treating until Forrest shares a spooky rumor that Mr. Price is a wizard who turns kids into chicken noodle soup.

Daniel and Katerina have to make their own noisemakers when Margaret wants her rattle back; Daniel, Prince Wednesday and Miss Elaina create a pretend neighborhood.

Jay and Lupe use wayfinding signs to track down Phoebe; Pete and Craig face an epic hoops battle on the courts.

Rudy is afraid of getting a shot at the doctor's office, so Nina and Abby play pretend to show what the visit will be like so he can feel less scared.

It's Backwards Day in the Treeborhood; Cece, Carly and Clyde have fun with patterns.

Donkey and Panda compete in the Breakfast Bowl; Donkey, Panda and Bob Dog plant Dancing Dandelion seeds and look for the right music to help the flowers grow.

Iggy wants to see the garbage truck, but Rosie doesn't know how to get it to come to their house; Rosie attempts to bring nature inside.

Pinkalicious can't wait to make valentines for her class party, but Cupid offers her a trade that turns her plans upside-down.

Molly and Trini gather supplies to make suncatchers for their friends, but they lose the beads on the way home from Nenana; Molly wants to surprise Mom with a pair of traditional beaded slippers for her birthday.

Xavier and Brad turn to Florence Nightingale for help with curing Yadina's hiccups; George Washington Carver explains the importance of plants.

Culinary Institute of America teacher Markus Farbinger bakes warm poppy-seed torte with poached apricots.

The modest 1720s gambrel has been restored, complete with a new ell and barn element; the crew gets a tour of the changes.

The power of Native languages and the inspirational people who save them, from secret recordings to Star Wars films dubbed in Navajo.

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

Dr. M. Sanjayan explores seven of Earth's bellwether biomes.

A 1977 Pelé-signed soccer ball; a 1933 RKO King Kong Bachrach photo; Winfred Rembert's Moonshiners painting circa 2001.

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

Removing aluminum siding; installing a new steel beam.

Cleaning up paint when it spills on the floor; how 3-way switches work and common wiring mistakes; installing a classic wooden split rail fence.

Charlie Phelps hires Eliza for a case involving his uncle, Dylan Cooper; it turns out that Scotland Yard is also after Cooper, putting Eliza in the middle.

Book must race against time to uncover the truth before anyone else ends up dead; Jack gets an unexpected answer when he confronts Trottie and Book.

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