How is calculus used in science? That might seem like an odd question to answer in a magazine intended primarily for elementary school teachers. After all, how much calculus gets used in elementary science? Here the author guesses that quite a few readers of this column do not know a whole lot about calculus and have not taken a course in calculus. He is addressing the question for a few reasons. First, the basic concepts of calculus, minus the complicated looking math, are not that difficult to understand. Second, calculus is behind many of the science concepts covered in elementary school. Third, every elementary school teacher, will, at some time or another, get student questions that have something to do with calculus and its applications in science.