1 The Nature of Things 8 p.m. on (CBC)
An episode called “Decoding Desire” attempts to untangle the mystery of sex and desire, exploring how the pursuit of pleasure and sexual diversity, not merely a biological imperative, may lie at the heart of what helps a species survive. Scientists observing animal behavior have begun to challenge old beliefs that males pursue sex for pleasure, whereas females view it mainly as a path to security.
2 Doc Zone 9 p.m. on (CBC)
An episode called “A TV Renaissance” examines how television has transformed the way we look at the world and each other more dramatically than any other medium in history. During his or her lifetime, the average Canadian will view more than 100,000 hours of television, which is the equivalent of watching TV 24 hours a day, 7 days a week for 12 years. The film also projects challenges that may lie ahead as the traditional TV business takes on online competitors such as Netflix.
3 Food Fighters 9 p.m. on (GLO) (NBC)
Not only do the competitors have weekly cook-offs against each other, they also have them against rivals of different ages as the second season of this contest begins, with Adam Richman (“Man Finds Food”) returning as host. Youngsters vie with adult entrants to impress — and also square off against — celebrity chefs. Any home cook who endures through all five rounds will win $100,000.
4 Wayward Pines 10 p.m. on (FOX)
A bomb left in his car makes Ethan (Matt Dillon) realize he may have learned too much about the town in the new episode “Betrayal.” He wonders if one or more of the locals in whom he placed his trust could be bent on eliminating him. Kate and Harold (Carla Gugino, Reed Diamond) meet with Nurse Pam (Melissa Leo) on fertility-related matters. Ben and Amy (Charlie Tahan, guest star Sarah Jeffery) get closer. Terrence Howard and Toby Jones also star.
5 Aquarius 10 p.m. on (NBC)
Given the Los Angeles setting of this drama, it’s likely that Hollywood would play into it — and it does, in a homicidal way, in the new episode “Cease to Resist.” A celebrity is murdered, but a studio’s executives try to prevent Hodiak (David Duchovny) from solving the crime. Emma and Sadie (Emma Dumont, Ambyr Childers) learn more about Manson (Gethin Anthony) from someone who’s a part of his history. Grey Damon and Claire Holt also star.