The intellectual achievement of only children.
Polit
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DF
Falbo
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D000124:Achievement; D000293:Adolescent; D000328:Adult; D001722:Birth Order; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007360:Intelligence; D008297:Male; D009863:Only Child; D010287:Parent-Child Relations