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Does birth order actually affect your IQ and personality? Not really, new study says

Aside from intelligence, the University of Illinois study also looked at personality characteristics—such as conscientiousness, extroversion, and neuroticism—and yielded a similar finding. Involving 377,000 U.S. high school students, the study published in the Journal of Research in Personality is the largest of its kind to look at birth order, personality and intelligence. Firstborns tend to be more conscientious, less sociable, and more dominant than younger siblings as well as more agreeabl