If I could get that dressmaker to make a concertina skirt like Susy Nagle’s
The Experiment: Split up twins after birth—and then control every aspect of their environments.
The payoff: Several disciplines would benefit enormously, but none more than psychology, in which the role of upbringing has long been particularly hazy. Developmental psychologists could arrive at some unprecedented insights into personality—finally explaining, for example, why twins raised together can turn out completely different, while those raised apart can wind up very alike.
