Man's Most Dangerous Myth was first published in 1942, when Nazism flourished, when African Americans sat at the back of the bus, and when race was considered the determinant of people's character and intelligence. It presented a revolutionary theory for its time; breaking the link between genetics and culture, it argued that race is largely a social construction and not constitutive of significant biological differences between people. In the ensuing 55 years, as Ashley Montagu's radical hypothesis became accepted knowledge, succeeding editions of his book traced the changes in our conceptions of race and race relations over the 20th century. Now, over 50 years later, Man's Most Dangerous Myth is back in print, fully revised by the original author.