Research in the field of behavioral genetics has established that the construct of "g" is highly heritable. It has a number of other biological correlates, including brain size. It is also a significant predictor of individual differences in many social outcomes, particularly in education and employment. The most widely accepted contemporary theories of intelligence incorporate the "g" factor. However, critics of "g" have contended that an emphasis on "g" is misplaced and entails a devaluation of other important abilities. Stephen J. Gould famously denounced the concept of "g" as supporting an unrealistic reified view of human intelligence.