Adoption study of 250-300 kids shows adoptive parents' behaviors do not influence offspring IQ. Picture Vocabulary Test measured IQ in middle/high school and again at 18-26. Parental interactions like family dinners or bedtime stories fail to boost IQ when genetics controlled. Previous studies wrongly attributed IQ gains to parenting due to genetic confounding. Smarter parents provide enriching environments but transmit IQ genetically to biological kids. Normal-range parenting within bounds has zero detectable IQ impact. Researchers from FSU, Nebraska, others analyzed National Longitudinal Study of Adolescent Health data. Non-adopted sample of 5,500-7,000 youth confirms patterns. Genetic transmission fully explains apparent parenting effects on intelligence. Study published in Intelligence journal November-December 2014.