I usually do this activity the first week of school, but we didn't get to it! Instead, we did it this week, and the kids loved it! I read the book Will the Boat Sink or Float?, (Sorry, I must have deleted the picture of the book, but it is on an earlier post!) discussed it, predicted what items would sink or float, and then performed the experiment. They did a fantastic job following directions, making predictions, and recording their experiment.