File:Criminal brains.jpg

An image of a 1920s image attempting to associate brain types to criminal behaviour. The theory is named biological determinism - heredity, more than environment or education, the idea went, caused social problems. Proponents of eugenics wanted to improve the human species through compulsory sterilization of criminals, the mentally retarded, and others deemed social misfits. Some two-thirds of Americans were said to support such measures.

Created by, and kept in, the Pennsylvania State University Libraries; taken from http://www.nlm.nih.gov/hmd/frankenstein/frank_celluloid.html hence public domain,