How we know II: Bad dreams. By Caveman.
D035843:Biomedical Research / Q000941:ethics / Q000379:methods; D005006:Ethnicity / Q000235:genetics; D005053:Eugenics / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D012108:Research Personnel