“You worked hard digging that hole,” “You really had to work to push that wagon,” and “Climbing on the monkey bars is hard work,” are phrases commonly heard on the playground. Children love to try difficult physical tasks that require the expenditure of energy. They know that even if they do not complete a task they will feel the satisfaction of working hard. Work is what they will be doing as they move water from one place to another, and the fact that the job has no apparent purpose doesn’t seem to bother them. As the teacher, however, you’ll know this “job” is giving students valuable practice in working with science tools.