Nova: Making Stuff Cleaner (9pm, UNC-TV) - Part 3 of 4 of "Making Stuff" examines the science and business of clean energy. Included: a scientist who uses chicken feathers to make hydrogen-powerd cars safer, whether lithium batteries create a dependence on South America, and whether scientists can create batteries that run on molten salts.

Human Target (9pm, Fox) - Chance has a reunion with an inept private investigator (Tony Hale) when the girlfriend of the owner of a rival security firm needs protection.

Cougar Town (9:30pm, ABC) - Jules' ultimate Valentine's Day wish is for Grayson to reveal his true feelings, but she may have to keep waiting. Meanwhile, Ellie wants nothing to do with the holiday and Travis asks Laurie advice on what to get Kirsten. This is the only new ABC comedy airing tonight.

Hot in Cleveland (10pm, TV Land) - Melanie, Joy, and Victoria are smitten with Elka's lawyer, who's angling for an insanity plea before a judge (Sherri Shepherd), but his client loses interest after learning that her former beau Max (Carl Reiner) is getting married.

Law & Order: SVU (10pm, NBC) - A billionaire (Colm Feore) becomes a suspect in a sexual abuse case involving a teenage girl, and his highly paid attorney (Robert Klein) is able to make the case veer off course.