Summer Olympics, Mermaids: The Body Found, You Live In What?

Summer Olympics, 8 p.m., NBC

Tonight, Track and field, finals: men's 4x400m relay, men's pole vault, women's 4x100m relay, women's 1500m; diving: men's platform qualifying; cycling: BMX finals. What does it say about us as a world culture that softball and baseball are out of the Olympics, but BMX cycling is in?

Mermaids: The Body Found, 8 p.m., Discovery

“A team of scientists claim to have found the remains of a sea creature with ties to human origins, a modern day mermaid.” Heads up, Moms: My 14-year-old and her friend watched this a couple of weeks back - and it scared the you-know-what out of them. And now they believe in mermaids.

You Live In What?, 9 p.m., HGTV

“Unlikely homes include a grain bin, a radio station and a slaughterhouse.” Ha ha. Mine would read: Amongst clutter and dust.