After the first observation of life under the microscope, it took two centuries of research before the "cell theory" was established. Luckily, today's teachers can take advantage of computer technology and speed up the discovery process in their classrooms. This article describes how computer-based instructional programs can be used to engage middle school students in learning about cells. One of these, the Cell Exploration Program, incorporates haptic (simulated tactile and kinesthetic feedback) technology and allows students to manipulate a virtual cell model in a three-dimensional workspace and to "feel" its organelles. Thus, taking advantage of these tools can create an engaging and enriching learning environment in which students can actively build their understanding of the complex "world of cells." (Contains 3 figures and 10 online resources.)