Birth order effects are like those things that you think you see out of the corner of your eye but that disappear when you look at them closely. They do keep turning up but only because people keep looking for them and keep analyzing and reanalyzing their data until they find them.

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Attribution

Quote text and notes from Wikiquote: Judith Rich Harris (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.