One and the Same: My Life as an Identical Twin and What I've Learned About Everyone's Struggle to Be Singular

Journalist Abigail Pogrebin is many things—wife, mother, New Yorker—but the one that has defined her most profoundly is “identical twin.” As children, she and her sister, Robin, were inseparable. But when Robin began to pull away as an adult, Abigail was left to wonder not only why, but also about the very nature of twinship. What does it mean to have a mirror image? How can you be unique when somebody shares your DNA?

In One and the Same, Abigail sets off on a quest to understand how genet...