As a "new science," nanotechnology has brought many nanoscale-based applications to the forefront of society. This article describes one such application--a nanosensor that can precisely detect a variety of chemical stimuli in the environment--and presents the science behind it as an interdisciplinary science topic. This article also provides scenarios that can be used in the classroom to discuss the unique ethical concerns associated with nanosensors. (Contains 1 figure and 1 online resource.)