Nature and nurture Intellect 8 Behavior genetics 7 Psychology 4 Developmental psychology 3 Environmental psychology 3 Individual differences 3 Intelligence levels 3 Brothers and sisters 2 Child development 2 Difference (Psychology) 2 Genetic aspects 2 Human behavior 2 Human genetics 2 Individuality 2 Longitudinal studies 2 Personality 2 Sex differences (Psychology) 2 Twins 2 Addresses, essays, lectures 1 Case studies 1 Child rearing 1 Children, Adopted 1 Cognition 1 Connectionism 1 Course studies 1 Creative ability 1 Early childhood education 1 Environment and children 1 Environmental ethics 1