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"BARBARA HERBERT, a former council worker living in southern England, discovered after the death of the woman she had thought was her mother that in fact she had been adopted. Among her assumed mother's papers, she found a name and address in Finland. When that produced no answer, she contacted the local newspaper in Finland. A reporter dug up the story. Her real mother had been sent to England, two months pregnant, in 1939. She had given birth, been sent back to Finland, and committed suicide at the age of 24. Mrs Herbert had a feeling the story was not over. She seemed to recall somebody saying, "There was another one." So she contacted Hammersmith Hospital, where she was born; and, sure enough, there had been twins. The Registrar-General refused to help her contact her twin. She took the Registrar-General to court, and won. That is how she found her sister. They met at King's Cross station in London. "We just said 'Hi' and walked off together, leaving our husbands standing there," says Mrs Herbert. "It seemed so natural." Mrs Herbert is a bit fatter than her sister, but she can think of no other important difference between them. Their intelligence quotients (IQs) were one point apart. They were tested again a year later; they scored ten points higher, but still only one point apart. Mrs Herbert and her sister Daphne are gold dust to geneticists. Unlike fraternal twins, who are the product of separate eggs fertilised by different sperm, identical twins are natural clones, produced when a fertilised egg splits in two shortly after conception. Such twins, when separated after birth, are thus a scientific experiment designed jointly by nature and by society. They have the same genes but have been brought up in different environments. These curiosities are getting rarer. Until the 1960s, twins offered for adoption in the West were often separated at birth, on the argument that two babies would be too much for one mother. That no longer happens