This document outlines a lecture on cognitive enhancement. It defines cognitive enhancement as improving cognition in cognitively normal individuals, and discusses stimulants like Adderall and Ritalin as common cognitive enhancers that work by increasing catecholamines like dopamine. The document also reviews epidemiological data on cognitive enhancer use, particularly among college students, and explores other potential enhancing drugs and devices. Finally, it lists several important ethical, legal and social issues raised by cognitive enhancement, such as safety, fairness, freedom, and implications for personhood.