Kallikak

n. The pseudonym for a family used as an example of the hereditary transmission of feeblemindedness in the early 20th century.

The book describing this family became very popular and was used in the political movement called eugenics, which prescribed selective breeding in human society to reduce the incidence of moral depravity and feeblemindedness. It has since been used in psychology as an example of biased and improbable research demonstrating the need for improved research methodology and scientific disinterestedness.