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Twin Studies is a category devoted to books that investigate what twins can reveal about human development, health, and behavior by disentangling the influences of genetics and environment. Titles range from academic and methodological works comparing monozygotic and dizygotic twins to estimate heritability, to popular science explaining twin registries, longitudinal designs, and advances in epigenetics and gene–environment interplay. Topics commonly include intelligence, personality, mental health, physical disease risk, addiction, education, and social outcomes, as well as prenatal influences and developmental trajectories. The category may also feature ethical discussions about identity, individuality, and research participation, along with memoirs and narrative nonfiction by twins that provide lived perspectives. Overall, Twin Studies offers both rigorous research and accessible storytelling centered on the twin lens for understanding human variation.

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