The Surprising Similarities Between Unrelated Twins

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A case of accidental twin exchange in the nursery leads to a study comparing the personalities of the genetically unrelated twins, revealing insights into genetic and environmental influences on human behavior.

The term can refer to a double, a ghost, a shadow. But it can mean much more. From our online mirror world, to digital simulators, to the Earth's twin--TED speakers learn from the uncanny second self. Guests include author Naomi Klein, aerospace engineer Karen Willcox, planetary scientist Sarah T. Stewart and psychologist Nancy Segal.

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