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Thoreau returns to society, taking on roles as surveyor, scientist and abolitionist, and makes two more Maine trips; Thoreau writes with renewed energy as he faces a lifelong illness.

Amid new attacks by the U.S. and Israel, investigating Iran's nuclear program; an updated and expanded investigation, drawing on reporting in Iran and in-depth forensic analysis with The Washington Post, Evident Media, and Bellingcat.

Henry David Thoreau pursues a career as an author, retreating to a cabin in the woods to live simply and write.

Thoreau finds solace in nature and writes two books at Walden Pond; over his two year stay, an expedition to Maine and an act of civil disobediance protesting slavery reshape his idea of freedom.

Sign off.

Lyla and Everett make a lemonade stand to raise money for the animal shelter; Lyla and Everett learn Double Dutch to become part of a neighborhood crew.

Carl loves the new sweater his Pop Pop knit him, but it feels itchy when he wears it; Carl is nervous about his new school bus stop.

Daniel meets a new friend, Max, who is autistic; Daniel and his friends help make Max more comfortable at Chime Time.

Phoebe plans a birthday surprise for Grandma; Phoebe and Jay must tend to the bell pepper in the garden.

Tango loses focus when Elmo tries to teach him a new trick.

Zadie helps Malik design a faster route to bring ice cream to a sick Sammy; Zadie tries to host a fun campout.

Duck Duck can't figure out how to fly Harriett's new Swoop-a-rino; Donkey takes Duck Duck on an adventure.

Rosie tries to send Abuela a birthday party in the mail; Rosie tries to send Gatita in the mail.

Elinor learns how webbed feet help ducks and other animals get around in the water; Elinor and Olive plan a camping breakfast for Elinor's dad's birthday.

Alma teaches Emi how to be like her, but now Emi won't stop imitating Alma; Alma tries to finish running the world's longest race.

Trini is determined to learn an ice skating move; Tooey and his brothers use tracking skills to find their dad in the forest.

Inventor James Naismith inspires Xavier, Yadina and Brad to invent their own game; Temple Grandin helps Yadina make friends with a new boy from her class, Ben.

Baker Flo Braker; crunchy butter galettes; raspberry-fig crostata.

Nathan installs a sliding barn door in an open-concept loft apartment; Tom compares different types of roofing materials; Ross explains the culprit behind damaged solar panels; Mark installs a dry well for a homeowner with drainage issues.

Moments in history that reshape the solar system and provide an understanding of the universe.

The many species of raptors, from giant eagles to miniature falconets, and how they survive bitter winters, learn to hunt and undergo epic migrations.

The investigation into the March 2024 container ship collision that resulted in the collapse of the Francis Scott Key Bridge in Baltimore.

Updated appraisals from 1998, including a treasure with an estimated value that should go somewhere between $70,000 and $90,000.

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

From snowy owls in the high Arctic to honey buzzards raiding hornet nests in Taiwan, a look at the extreme ways in which raptors conquer the toughest habitats on Earth.

Understanding how the brain shapes reality, including the tricks and shortcuts the brain takes to keep a person alive; with neuroscientist Heather Berlin.

Four people on four continents face environmental change driven by climate change; as resources grow scarce, they witness shifts in wildlife behavior.

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