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An inside look at protests that have shaken Iran since the death of a young woman in police custody.

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

Actresses Debra Messing and Melanie Lynskey explore the stories of their ancestors whose bold decisions reshaped their families.

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.

A Venezuelan family struggles to retain its legal status amid President Donald Trump's immigration crackdown; the uncertain future of those who fled to the U.S., including men who were sent to a prison in El Salvador.

Nature Cat gets his big break when director Quentin Bearantino sees how perfect he is for the role of Cowboy Kitty; Nature Cat and the gang bring Hugo's farm back to life.

Lyla and Everett make pins for New Year's Eve; Lyla and Everett clash while making a fun unboxing video for Phan Hardware's Summer Sale.

Brain, D.W. and Bud explore the inner workings of the brain; Brain may finally see a meteor shower.

Omar gets stuck in a white void all by himself; Opal and Oswald search the Old Woods to find ingredients for the antidote to help Omar's case of Clown-i-tosis.

The Wild Kratts are busy coloring eggs for Easter; the bros think an adventure can be to go find the real Easter Bunny; Chris thinks it's the snowshoe hare, while Martin thinks it's the jackrabbit.

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

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.

A wedding dress circa 1798; a 1912 Ivan Khlebnikov jewelry casket; a George William Sotter oil.

Mike and his team explore the world of antiquities when one of the hosts of a hit series is found murdered.

A conscientious objector dies while in police custody, and the judge who had him arrested gets a death threat.

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

Filmmakers Howard and Michele Hall embark on a daring expedition across the South Pacific to document the world's most beautiful and endangered coral reefs.

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.