Letters to the Editor
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Why now?
So... This study ended in 1977? A million years ago? Why results only now? Is this sort of a Can't-Find-Monkeys-Might-As-Well-Use-Guatemalans thing?
Because they were studying pregnant women and small children. Those children born in 1977 would be 30 years old now, so the study tracked their cognitive development, educational progress, and eventual (one would hope) entrance into the job market. With 30 years of mental and social development, the researchers get a bigger picture of the effects of early nutritional intervention.

