In July 2019, Christopher Ferguson published an article in Quillette on the replication crisis in psychology. As an academic psychologist, I appreciated his clear and concise discussion of some of the difficult issues facing psychology’s growth as a science, including publication bias and the sensationalizing of weak effects. I believe a related, but perhaps less-recognized, illness plagues psychology and related disciplines (including the health sciences, family studies, sociology, and education). That illness is the conflation of correlation with causation, and the latest research suggests that scientists, and not lay people and the media, are the underlying culprits. Correlation and Causation We have probably all heard the cliché “Correlation is not causation.” Of the criteria for documenting that one variable causes a change in another variable, correlation is just the first of three. That is, the first criterion for documenting that one variable causes a change in another variable is evidence that the two variables covary together: as one goes up, the other tends to, too (a positive correlation; for example, students who score high on …