Gordian worms are parasites that live inside the likes of beetles, cockroaches, and crickets. The worms can be as long as one meter and 3 millimeters in diameter. Here is a video of a gordian worm emerging from its host in a swimming pool. Gordian worm (YouTube, via 37 Signals, thanks Sean Ness!)
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.