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Exploring the unique evolutionary journey of woodpeckers and the role they play in every ecosystem, except Antarctica and Australia.

Archaeological investigations into the origins of democracy in Greece 2,500 years ago; mass graves and ancient ruins where tyrants were murdered shine light on the birth of a revolutionary form of government.

From New York to Kolkata, dicovering the surprising and beneficial ways urban wildlife transforms cities into thriving, shared ecosystems.

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Carl takes his friends on an "Amazing Smell Tour of Fuzzytown," but Lotta doesn't agree with Carl's list of the best smells; Carl and his friends go on a camping trip.

Daniel takes a spoon away from Margaret, which makes her cry; Teacher Harriet explains that you should ask first before taking something away from someone.

Phoebe and Jay use Miss Jean's field guide to identify their new butterfly friend; Phoebe gets courage to perform at the talent show.

Elmo tries to win a race without eating his sandwich, but learns that eating healthy food will give him energy; Cookie Monster tries to eat the sandwich for himself.

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

Donkey and Panda have different ideas about how to celebrate Best Friends Day; while getting ready to make big art, the pals get stuck to a big glue bottle.

Rosie and Javi learn how people did things before there was electricity after a storm causes a power outage; Rosie learns to use tools from nature during a family camping trip.

While delivering chocolates, the kids learn that warmer temperatures can melt treats; the kids help Mr. Raccoon calm down when he is having a bad day.

When Alma and her family travel to Puerto Rico to visit Papi's family, Alma can't wait to dance Bomba on the beach; her dancing plans are put on hold when an unmarked package containing a beautiful Bomba skirt is dropped in front of her bisabuela.

While fishing, Molly and her cousin, Randall, encounter a sea lion with a strange word written on its back; Molly's scout troop halts its hike when Trini scrapes her knee.

Xavier and Yadina overcome a sibling spat with the help of Confucius; Sacagawea helps Xavier and Brad realize that just because Yadina is younger, she can do more than they think.

Johanne Killeen prepares rhubarb upside-down baby cakes, hazelnut baby loaves and johnnycake cobblers.

Tom explains the architecture, installation, and maintenance of white cedar shingles; Richard explains common failure points in hose spigots and how to repair them; Jenn travels to Raleigh to help a couple with a self-watering vegetable garden.

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.

The automobile brings new freedoms as well as perils to Blacks on the road from the 1930s to the late 1960s.

Letters from 1968 include Bill Clinton's opinions on politics and war; Lalique hood ornament; 1952 John Falter illustration.

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

Kevin demos a wall in the primary bedroom; framing an exterior wall to tie old and new spaces together; reviewing shared plumbing for the ADU; burying a new 400-amp service to feed both homes.

Turning a flower vase on the lathe; how to start seeds indoors for spring; breaking down common mortar cracks in fireplace hearths and surrounds; upgrading a garage door opener by adding a Wi-Fi hub.

An expectant father receives a life-threatening diagnosis; Trixie assists a female wrestler after a headlock goes wrong; Dr. Turner learns shocking news that implicates the future of the maternity house.

In Paris high society, Edmond meddles in the lives of those he wishes to destroy; Edmond struggles to conceal his identity from Mercedes.

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