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A chameleon searches for a mate in Madagascar; a Scottish water vole swims a lake, climbs a waterfall and scales a mountain to find a place to raise her pups.

The crucial ecological roles that beetles play in nearly every environment, and why they are often regarded "the most important species on the planet.".

Relationships aboard the ISS are tested when war breaks out on Earth.

Robots are first conceptualized in ancient Rome; how uses for robots have evolved over the centuries, from the calculator to the Roomba; what future robots might be able to do.

Neil Dudgeon and acting royalty Dame Diana Rigg travel around their native Yorkshire; Neil finds his feet in the world of antiques, while Dame Diana shows her expert that she's in charge right from the start.

Engaging in the basics of daily life.

Muffy, Francine and Molly make their own movie; D.W. wants to get married.

The Neighborhood's garbage problem is solved through a cooperative effort.

The Hunters search for a way to monitor the weather after they lose power during a thunderstorm.

Lyla gets a strike her first time bowling but gets frustrated when she realizes bowling isn't as easy as she thought it was; Lyla feels left out when Everett and Ale's friendship thrives.

Carl and Sheldon are on a thank-you mission; Carl shows his friends the right way to play with pet rocks.

The life, career and music of Dolly Parton are reflected in interviews with friends, companions and the artist herself, mixed with clips of Parton's performances.

Filmmaker Ken Burns tells the story of Thomas Jefferson, beginning with his youth in the Virginia wilderness and his early political career.

Jefferson's terms as Secretary of State and Vice President, and his election to the presidency; the highs and lows of Jefferson's retirement to Monticello.

Broadcast performance clips from 1956 include Elvis Presley's appearances on "The Ed Sullivan Show" and "The Steve Allen Show.".

John Williams conducts the Berliner Philharmoniker for the very first time; music includes "Olympic Fanfare and Theme.".

Josh Groban performs many of his beloved songs as well as new material at London's historic Union Chapel.

Cast and creators provide behind-the-scenes insights into Season 6.

Edith is enthusiastic about her wedding and hopes to convince her family that Strallan's age does not matter. With Downton's finances dire because of Robert's actions, Mary takes matters into her hands -- but the personal price may be high.

Kitty's personal confrontation with the past sends Weyse into a rage; the best kept secret in the hotel is suddenly revealed.

The Toyota bZ, formerly known as the bZ4X; the Mazda CX-50 Turbo; Quick Spins; a special FYI report on teen driving safety.

Science, health, technology and environment experts and professionals address issues such as artificial intelligence, medicine and climate science.