Everyone has heard of the term "pseudoscience," typically used to describe something that looks like science, but is somehow false, misleading, or unproven. Given the virulence of contemporary disputes over the denial of climate change and anti-vaccination movements-both of which display allegations of "pseudoscience" on all sides-there is a clear need to better understand issues of scientific demarcation. Pseudoscience: A Very Short Introduction explores the philosophical and historical attempts to address this problem of demarcation. This book argues that by understanding doctrines that are often seen as antithetical to science, we can learn a great deal about how science operated in the past and does today. This exploration raises several questions: How is the status of science shaped by political or cultural contexts? How does pseudoscience differ from scientific fraud? Michael D. Gordin both answers these questions and guides listeners along a bewildering array of marginalized doctrines, looking at parapsychology (ESP), Lysenkoism, scientific racism, and alchemy, among others, to better understand the struggle to define what science is and is not. Pseudoscience: A Very Short Introduction provides a historical tour through many of these fringe fields in order to provide tools to think deeply about scientific controversies.