Writer. Mother. Wife. New Yorker. Abigail Pogrebin is many things, but the one that has defined her most profoundly is "identical twin." Pogrebin's relationship with her sister---both as children, when they were inseparable, and today, when she longs for that uncomplicated intimacy---inspired her to examine the phenomenon of twinship, to learn how other identical pairs regard their doubleness and what experts are learning about how DNA impacts...
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