QUOTE : Hilda argued that our fate is more likely determined by what she called our “unique environment”—the one we do not share with anyone, not even our siblings. It is the environment we seek out and create for ourselves, for example, when we find something which delights and fascinates us and drives us in a certain direction. Rather like Blomkvist’s reaction as a young boy, perhaps, when he saw the film All the President’s Men and was struck by a strong urge to become a journalist. Heredity and environment interact constantly, Hilda wrote. We seek out occurrences and activities which stimulate our genes and make them flourish, and we avoid things which frighten us or make us uncomfortable. She based her conclusions on a series of studies, among others MISTRA, the Minnesota Study of Twins Reared Apart, and investigations by the Swedish Twin Registry at the Karolinska Institute. Identical twins, or so-called monozygotic twins, with their essentially indistinguishable sets of genes, are ideal subjects. Thousands of twins, both identical and fraternal, grow up apart from each other, either because one or both have been adopted, or, more rarely, as the result of some unfortunate mix-up in a maternity ward.