They had been separated at birth to pursue study of ‘nature vs. nurture’. The child psychiatrist who orchestrated the study was without remorse when the twins confronted him. He had been willingly aided by the adoption agency handling their placements, whose psychological consultant felt that it was unhealthy for identical twins to be raised together. Aware that his study would be criticized, the author had locked away the report in the Yale University archives, not to be opened for a century. (Telegraph.UK)