Discussions of race and intelligence—specifically regarding claims of differences in intelligence along racial lines—have appeared in both popular science and academic research since the modern concep
Autodidact and abolitionist Frederick Douglass (1817–1895) served as a high-profile counterexample to myths of black intellectual inferiority.
Alfred Binet (1857–1911), inventor of the first intelligence test
An environmental factor that varies between groups but not within groups can cause group differences in a trait that is otherwise 100 percent heritable.
Race is a categorization of humans based on shared physical or social qualities into groups generally viewed as distinct within a given society. The term came into common usage during the 16th century
The "three great races" according to Meyers Konversations-Lexikon of 1885–1890. The subtypes are: Mongoloid race, shown in yellow and orange tones Caucasoid race, in light and medium grayish spring green-cyan tones Negroid race, in brown tones Dravidians and Sinhalese, in olive green and their classification is described as uncertain The Mongoloid race sees the widest geographic distribution, including all of the Americas, North Asia, East Asia,
"Races humaines" according to Pierre Foncins La deuxième année de géographie of 1888. White race, shown in rose, Yellow (Mongoloid) race, shown in yellow, Negroid race, shown in brown, "Secondary races" (Indigenous peoples of the Americas, Australian aboriginals, Samoyedic peoples, Hungarians, Malayans and others) are shown in orange
Portrait "Redenção de Cam" (1895), showing a Brazilian family becoming "whiter" each generation