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Recent studies, as summarized, for example, in E. Mortensen et al. (2002). The association between duration...

Recent studies, as summarized, for example, in E. Mortensen et al. (2002). The association between duration of breastfeeding and adult intelligence. Journal of the American Medical Association, 287, 2365–2371, suggest that breastfeeding of infants may increase their subsequent cognitive (IQ) development. Both experiments and observational stud

What determines whether some of these studies are experiments?

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