Identical Strangers: A Memoir of Twins Separated and Reunited is a 2007 memoir written by identical twins Elyse Schein and Paula Bernstein and published by Random House. The authors, born in New York City in 1968 to Leda Witt, daughter of Nathan Witt, were separated as infants, in part, to participate in a "nature versus nurture" twin study. They were adopted by separate families in the New York area who were unaware that each girl had a twin sister. Soon after the twins reunited for the first time in 2004 at the age of 35, they began writing the book. Of the 13 or more children involved in the study, three sets of twins and one set of triplets have discovered one another. One or two sets of twins may still not know they have an identical twin. Source: Wikipedia (en)