This is one of the most fascinating stories I've ever read. And, um, the creepiest. Apparently thousands of spiders from at least twelve distinct species have evolved a never-before-seen cooperative behavior that has allowed them to work together to build a web that has effectively taken over part of a state park in Texas. The web is - are you paying attention? - the size of two football fields. Here's the piece from Wired News. More from Wired's Adam Rogers here. And a story from the Dallas Star-Telegram here.