Kin
Kin refers to one's family members or relatives connected by blood, marriage, or adoption, forming the essential web of personal and social bonds. In modern contexts, it often extends beyond biology to include chosen families or close allies, emphasizing emotional ties in an increasingly diverse world.
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In evolutionary biology, the concept of 'kin selection'—first formalized by British biologist J.B.S. Haldane in the 1930s—explains why organisms help their relatives, potentially at a personal cost, because shared genes increase the survival of their genetic line; for example, studies show that vampire bats are more likely to share blood with close kin, boosting group survival rates by up to 30%. This idea has transformed our view of altruism, revealing that self-sacrifice isn't always purely selfless but often driven by genetic strategy.
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