"How much popcorn will our classroom hold?" This intriguing question sparked a terrific integrated science and math exploration that the author conducted with fifth-and sixth-grade students. In the process of finding the classroom's volume, students developed science-process skills (e.g., developing a plan, measurement, collecting and interpreting data, prediction, inference, communication, and using number relationships) and applied mathematical process (determining an estimate, using benchmarks, measuring, mapping, etc.) in a meaningful way--getting an authentic glimpse of how these two subjects are inextricably linked. (Contains 3 resources.)