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In How We Got to Now with Steven Johnson (8 p.m., PBS/Ch. 7), science and technology writer Steven Johnson shares the stories behind the ideas that made the modern world possible. First up - how we got clean water.
It's surprising and fascinating stuff.
Elsewhere on TV ...
Baseball playoffs: ALCS Game 4 - Baltimore Orioles at Kansas City Royals (2 p.m., TBS); NLCS Game 4 - St. Louis Cardinals at San Francisco Giants (6 p.m., FS1)
Survivor (7 p.m., CBS/Ch. 2): There's a plot afoot for one team to throw an immunity challenge - which has always proved to be a mistake on "Survivor."
Toy Story of TERROR! (7 p.m., ABC/Ch. 4): The toys go on a road trip and get detoured to a roadside motel. (Repeat)
The Mysteries of Laura (7 p.m., NBC/Ch. 5): An unidentified man is found murdered in the bathroom of a home where no one knows who he is.
Nature (7 p.m., PBS/Ch. 7): "Animal Misfits" spotlights everything from the giant panda to the big-headed mole rat, an ant-sized chameleon to the deep-sea nautilus and more.
Hell's Kitchen (7 p.m., Fox/Ch. 13): The teams have to create dishes inspired by Italian operas.
High school football (7 p.m., Ch. 14): Brighton at Jordan
Arrow (7 p.m., CW/Ch. 30): A mysterious archer known as Komodo begins skewering businessmen.
It's the Great Pumpkin, Charlie Brown (7:30 p.m., ABC/Ch. 4): Classic Halloween animation. (Repeat)
Criminal Minds (8 p.m., CBS/Ch. 2): The team investigates a suspicious plane crash.
Modern Family (8 p.m., ABC/Ch. 4): The Dunphys have to move into a hotel while their house undergoes mold remediation.
Law & Order: SVU (8 p.m., NBC/Ch. 5): The deputy chief of SVU expresses doubts about Benson's leadership.
Red Band Society (8 p.m., Fox/Ch. 13): Details of Charlie's accident are revealed.
Franklin & Bash (8 and 10 p.m., TNT): Cloris Leachman guest stars as a gypsy.
Black-ish (8:30 p.m., ABC/Ch. 4): Dre takes over Rainbow's mom duties for a week.
Stalker (9 p.m., CBS/Ch. 2): Oh, charming. A bride is shot by a sniper during the wedding ceremony. And that's entertainment?
Nashville (9 p.m., ABC/Ch. 4): Rayna tries to sign Sadie to her label.
Chicago PD (9 p.m., NBC/Ch. 5): Two teenage girls disappear.
South Park (11 p.m., Comedy Central): Timmy's new car service makes him a lot of enemies.
American Horror Story: Freak Show (11 p.m., FX): A man from Ethel's troubled past arrives at camp.
Key & Peele (11:30 p.m., Comedy Central): Sketches include a mobster seeking vengeance and Urkel driving a guy crazy.