Are you a first-born? A middle child? A twin? An only child? In his new book The Sibling Effect: What the Bonds Among Brothers and Sisters Reveal About Us, author Jeffrey Kluger describes current scientific research into the effects of siblings on human behavior, from birth order studies to sibling rivalries and fighting.
Source: http://www.npr.org/2011/09/16/140537846/science-looks-at-the-sibling-effect?ft=1&f=1007
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