Mixed-race populations show intermediate IQ between parental races in 9 of 10 admixture studies. Latin American groups with more European ancestry score higher on tests than those with more Amerindian ancestry. Intermediate skin color correlates with intermediate IQ in 4 studies. Blacks with intermediate African admixture score intermediate on IQ in 4 of 6 studies. Hispanics are more violent and incarcerated than whites despite admixture. Mixed couples in Canada have 2.94 times higher mutual assault rates than white couples. Interracial marriages have second-highest divorce risk after anxiety disorders. Scottish mixed-race people have shortest life expectancy among groups. Brazilian mixed males match white males at 71 years life expectancy – mixed females exceed whites by 1.26 years. US Hispanics live longer than whites but more homogeneous Hispanics live even longer. Hispanic life expectancy correlates positively with genetic homogeneity. No mechanism selects ''best'' genes in race-mixing due to random mitosis. Outbreeding depression disrupts co-adaptive gene complexes across races. Inbreeding depression is only publicized mechanism despite outbreeding risks. Black male-white female pairings yield worst outcomes. Asian male-white female pairings often fail due to desperation and mismatch.