Nielsen Media Research announced plans to expand its use of people meters, a change likely to boost cable ratings, according to the Los Angeles Times.

"Unsettling hours about the airborne evils that Americans have been told to await"--"Dirty Bombs," airing tonight on PBS's Nova, and "Bioterror: The Invisible Enemy," debuting tomorrow on the Discovery Channel. The New York Times reviewer says both offer "dreadful insights and fodder for fear."