Sibling Science

I found your cover story on birth order fascinating [Oct. 29]. For many years, I have attempted to interpret myriad human actions through the filter of birth order. Although I understand a theory is far from a catchall answer to psychological mysteries, I believe this one explains a large part of our behavior. Thank you for publishing the latest research.
Kathryn Bridges Pulliam, MOBILE, ALA., U.S.

I have three sons, so I read your article on birth order with interest. Example after example that you supplied showed that upbringing and parents' expectations influence children more than...

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