Current Wentzville, Missouri Population, Demographics and stats in 2016, 2017.
David Wechsler. developed an intelligence test for adults in the US (WAIS), an intelligence test for children (WISC, which has been revised and is now the WISC-IV), and an intelligence test for preschool (WPPSI).
Fluid and crystallized intelligence are described as discrete factors of general intelligence, or g (Cattell, 1987). Charles Spearman (1927), who originally developed the theory of of the g, made a similar distinction between eductive and reproductive mental ability.