One of the concepts taught to science students is the use of hemocytometer. Students in microbiology, genetics, and anatomy and physiology (A&P) classes use the hemocytometer in a variety of activities. In microbiology and genetics classes, it is used to quantify yeast cells, while in A&P classes; students learn how to count blood cells. This activity provides instructors with a simple way to assist students in understanding the hemocytometer before students use it in later experiments that require cell counting. (Contains 2 figures.)