One of the most remarkable devices embedded in a Microsoft Excel spreadsheet is known as the spinner. Its staggering simplicity is undoubtedly its strength. As an incrementing device that allows graphs to dance across the screen, it gives the concept of variability a whole new meaning. Spinners and their close cousins scroll bars can be grabbed from the view menu (under tools, forms), placed tactfully in amongst your equations, and playfully put to work. This article is one such investigation using the little critters, but there are many more.