Graphics are among the most important forms of communication in science and engineering. They are invaluable for both expressing understanding as well as generating new ideas. Unfortunately, many students do not think they can draw, and therefore fail to take advantage of this means of expression. However, with some basic instruction, nearly anyone can learn to create an effective "sci-a-gram." The ability to illustrate not only enlarges a student's capacity for conveying ideas but also provides the teacher with another window into a student's thinking. This article discusses how an in-class drawing instruction gives students the skills and confidence to make more accurate scientific diagrams. (Contains 7 figures, 1 table, and 1 online resource.)