On a rainy day, you'll often see lots of earthworms on sidewalks and roads. But what makes the worms crawl away from the safety of the soil when it's raining?
Some people assume worms come to the surface so they do not drown in their burrows. However, "worms don't have lungs like we do," Thea Whitman, a soil scientist at the University of Wisconsin-Madison, told Live Science.
