Photolithography is a key technology that brought cellphones and computers into our daily lives. Photolithography is also being used to shrink complex and expensive medical diagnostic facilities into handheld devices, which we may soon use at home or on the go. This class will use Sunprint® paper to demonstrate photolithography. In this class, students will learn about the adsorption and emission of light in terms of the Bohr model, and learn about photolithography utilizing Ultraviolet (UV) light induced chemical reactions. Students will perform hands-on experiments and then present and reason through their results.