By ROB OWEN, Pittsburgh Post-Gazette

The most notable change in prime-time television this fall is also the biggest change to the broadcast network landscape since upstart rival Fox launched in 1986. NBC will forgo its mantle as a home for adult, quality 10 p.m. dramas ("ER," "L.A. Law," etc.) in favor of stripping "The Jay Leno Show" at 10 p.m. Monday through Friday.

PBS bets that its youngest viewers will love them together in "Dinosaur Train," a new computer-animated series from Jim Henson Productions that premieres Monday with a two-hour marathon of episodes (8-10 a.m. EDT).

Laura Leighton and Thomas Calabro won't be the only familiar faces on the new "Melrose Place." Josie Bissett, who played Jane (Syd's sister), and Daphne Zuniga, who played photographer Jo, will also make appearances this fall. Producers have also been talking with Grant Show, who played Jake in the original series.

Set aside that a remake of "Melrose Place" just 10 years removed from the original seems like too much too soon. The CW's new version of the 1990s soap begins with a surprisingly well-made pilot that's better than either the 1992 first episode of "Melrose Place" or last year's "90210" reboot.

We humans sure are skilled at creating division where none should exist. That's one of the central themes of National Geographic Channel's "The Human Family Tree" (9 p.m. EDT Sunday), which uses scientific advances to show how we're all connected.

Showtime's "Nurse Jackie" ends its first season Monday as it puts the title character's infidelity front and center.

It's easy to understand filmmaker Barry Blaustein's enthusiasm for high-school musicals, which he brings to the uneven documentary "Guys 'N Divas: Battle of the High School Musicals" (8:30 p.m. EDT Thursday, Aug. 27, Showtime).

Discovery Channel lucked into a sellable concept with "Out of Egypt," a new series hosted by Kara Cooney, a youthful UCLA assistant professor of Egyptian art and architecture.

You can find many celebrities posting their thoughts on Twitter simply by searching for them by name. But beware of imposters. The Web site CelebrityTweet.com lists stars on Twitter. Here are a few to get you started:

Paula Abdul: PaulaAbdul

David Blue: DavidBlue

Jane Espenson: CapricaSeven

Ming-Na: MsMingNa

Paul Feig: paulfeig

When Paula Abdul wanted to make a splash, she didn't call a press conference or give an interview. She used Twitter, the same social-media site where she once told her fans, "Craving some ice cream ... Mmmm."