I learned something new about earthworms today! My favorite line from the UofM paper:

They get from place to place very slowly. People, however, can transport them much more quickly on muddy tires,

The visual of worm-infested muddy tires makes me !LOLZ. Yes, I suppose it could happen, but... it's just a funny visual for me. Mud caked onto the tires of some SUV with little worms whipping around and around and around. WEEEEEE! C'mon guys, let's invade some Michigan forests!