Goal 3 of the National Science Education Standards (NSES) calls for students to “engage intelligently in public discourse and debate about matters of scientific and technological concern” (NRC 1996, p. 13). The unit described in this chapter, “Clean—At What Cost?” focuses on addressing this goal through a series of activities that allow students to develop an understanding about the use of nanotechnology that has potentially direct effects on their lives. The unit was developed for middle and high school students for integration into the science curriculum at a variety of possible locations (such as in lessons on microbiology, properties of matter, or impact of science and technology). This free selection includes the Table of Contents, Foreword, and Index.