Highlights: October 7-13

Nature at 6 pm Sunday visits Kilauea on Hawaii’s Big Island, the world’s most active volcano that began erupting in 1983 and hasn’t stopped since.

Call The Midwife at 7 pm Sunday and 9 pm Saturday anticipates a new arrival at Nonnatus House as Jenny Lee settles into her role as midwife.

Masterpiece Classic Presents: Upstairs Downstairs, Series 2 at 8 pm Sunday sees two new arrivals make their mark as 165 Eaton Place reopens its doors, while Lady Agnes’ concern for her children reveals a dark secret about Mr. Pritchard.

History Detectives at 7 pm Tuesday attempts to unravel the details behind the heroic acts pictured in a poster about two African-American soldiers in World War I as well as a hand-drawn map of Valley Forge that George Washington may have used during the American Revolution.

Frontline at 8 pm Tuesday takes the long view of the upcoming presidential election, through sweeping panoramas of the candidates’ biographies and explorations of the national landscape that shapes the campaigns, voters’ attitudes and the winner’s prospects for governing.

On Nature at 7 pm Wednesday, Chris Morgan takes on his greatest challenge in tracking large predators – to find and film the Siberian tiger living wild and free in Russia’s far eastern forests – in “Siberian Tiger Quest”.

NOVA at 8 pm Wednesday uses cutting edge science and old-fashioned detective work to reconstruct the ultimate weapon of the Viking era – the Ulfberht sword – and finally unravel its mystery in “Secrets of the Viking Sword”.

NOVA ScienceNow at 9 pm Wednesday explores the traits we once thought were uniquely ours – language, tool-making, even laughter – to uncover their evolutionary roots in “What Makes Us Human?”

Iconic British band Radiohead give a rare, full-hour performance of fan favorites as well as brand new tracks on the season premiere of Austin City Limits at 10 pm Wednesday and Friday.

Writer and historian Joe Nick Patoski discusses his career on Overheard with Evan Smith at 7 pm Thursday.

Chet heads to Bay Area Houston to visit NASA, eat a hoagie and fried shrimp, go birding on Armand Bayou, and visit the Kemah Boardwalk on The Daytripper at 7:30 pm Thursday.

PBS Newshour at 8 pm Thursday presents live coverage and analysis of the vice presidential candidates’ debate.

Voces on PBS at 9 pm Friday presents “Unfinished Spaces”, the story of the Cuban National Arts Schools and its construction through which we see the turbulent, ever-shifting history of Castro’s Cuba.

See how to combine edibles and ornamentals on this preview of the Master Garden tour on Central Texas Gardener at noon Saturday.

Grammy award-winning artist Bon Iver debuts his brand of atmospheric indie pop to the stage of Austin City Limits at 7 pm Saturday.