A major twin study is shedding new light on the long running debate over nature versus nurture, suggesting that genetics may play a far larger role in future success than many people realize. Researchers found that IQ measured at age 23 was strongly connected to socioeconomic status by age 27, including education, occupation, and income. According to the study, much of that connection appears to be tied to genetics rather than upbringing alone. The findings come from the German TwinLife project, a long term research effort designed to examine how genes and environment shape people's lives over time. Twin Study Explores IQ and Life Outcomes The research followed about 880 people, including both identical and fraternal twins. Roughly half of the participants were identical twins, who share all of their genes, while the others were fraternal twins, who share about half.…