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One morning in 1969, out of the blue, I received a letter which both distressed and astonished me. It was from a Prof. S. R. Das in Calcutta, who requested me to accept, for eventual analysis, a mountain of anthropometric data he had accumulated, as he was ill and did not expect to survive to analyse it himself. The data provided the astonishment; twenty-two anthropometric characters recorded every six months or a year, over a period of 14 years, in a mixed longitudinal study of some 560 children, aged six months to twenty years. Most were in families with siblings also in the study, and...

One morning in 1969, out of the blue, I received a letter which both distressed and astonished me. It was from a Prof. S. R. Das in Calcutta, who requested me to accept, for eventual analysis, a mountain of anthropometric data he had accumulated, as he was ill and did not expect to survive to analyse it himself. The data provided the astonishment; twenty-two anthropometric characters recorded every six months or a year, over a period of 14 years, in a mixed longitudinal study of some 560 children, aged six months to twenty years. Most were in families with siblings also in the study, and...