When the TV ratings reports come out, we (and every other network exec and TV geek) mostly concentrate on two numbers: total viewers and the key demo of 18-49. That's all well and good, but when you widen your advertiser-friendly tunnel vision, there are more odd and fascinating nuggets to be found in the farther-flung categories exhaustively broken down by Nielsen. Which reality show mesmerizes the most kids ages 2-5? What series do the one percent least enjoy? How many NBC shows does it take to equal the audience for one episode of NCIS? We have bathed in ratings reports and come up with 28 illuminating, surprising, counterintuitive, and, yes, sometimes thoroughly demoralizing factoids about who is watching what.