A Slimy Story (Science Solves It!)

Dan has a dilemma. His mother's surprise birthday party is just a few days away, and he has no idea what to give her. On top of that, it's raining outside and the ground is covered in slimy, disgusting earthworms! Yuck! When Dan unwittingly carries one of the creatures to class, he learns something that helps him come up with the perfect birthday present.