Because red wiggler composting worms do very well indoors, a worm composting bin is a great educational addition to a classroom. Teachers can use it as an Earth sciences teaching tool while also composting veggie food scraps from snack time or from the cafeteria. The worms will be fine over the weekend, no need to come in and check on them, just be sure to take them home over the summer!
For more info about worm composting with children read: Worm Composting for Kids