A little while ago, a reader wrote to us about a strange phenomenon he had witnessed: he found a group of worms, or what appears to be a group of worms (they may not actually be worms), on his driveway. He sent us a picture of his find, which seems to show a section of the of group worms; they are all oriented in the same direction, almost as if they were collectively forming the shape of a huge worm. However, the reader described what he found as a “cluster of worms,” so perhaps the worms are less well organized than it appears. It’s a striking find, so naturally our reader is curious what he found, and if they present a danger to his kids. What is this group of worms, if they are worms, and are they dangerous?