How's this for fascinating: Heritability of various aspects of cognitive development is very high (e.g., around 70 percent for IQ) in kids from high-socioeconomic status (SES) families but is only around 10 percent in low-SES kids. Thus, higher SES allows the full range of genetic influences on cognition to flourish, whereas lower-SES settings restrict them. In other words, genes are nearly irrelevant to cognitive development if you're growing up in awful poverty--poverty's adverse effects trump the genetics.fn24 Similarly, heritability of alcohol use is lower among religious than nonreligious subjects--i.e., your genes don't matter much if you're in a religious environment that condemns drinking. Domains like these showcase the potential power of classical behavior genetics.