Tuesday, March 7
5 p.m. “Megastructures”
A look at the design of the new AIRBUS 380, a massive passenger jet that can seat 380 people. It’s so big even your carry-on luggage can get lost. National Geographic Channel
6 p.m. “Dr. Know”
This week, doctors question the common wisdom linking acne and greasy foods. It turns out the link between pizza and “pizza face” is not medically significant. Discovery Health
6:30 p.m. “The Search for a Supermodel”
We’re not sure how this new reality series differs from “America’s Next Top Model” but it’s on Showtime so they’re probably required to spend half the show topless. Showtime
8 p.m. “The Unit”
This new show follows the exploits of an elite special forces unit. In the premiere they are dispatched to save businessmen held hostage on a hijacked plane. Not only does the team have to save them, they also have to make sure their lunch gets canceled and their tee time pushed back. CBS
8 p.m. “Sons & Daughters”
Yet another new sitcom about an extended family, only this one is more extended than most with upwards of a dozen characters annoying each other with rivalries and grudges. This is why experts recommend moving at least two time zones from your family. ABC
8 p.m. “Everybody Hates Chris”
Chris has to spend the day at the laundromat. It’s sort of like prison, but you run out of quarters. UPN
10:35 p.m. “The Late Show with David Letterman”
The Beastie Boys perform one last time before changing their name to the Beastie 40somethings. CBS