VINDICATION AT LAST! I think I will send this to my little (6'4") brother today. He would really enjoy it. Did I mention his wife is a firstborn, too? ;) Study on I.Q. Prompts Debate on Family Dynamics By BENEDICT CAREY The new evidence that eldest children develop higher I.Q.’s than their siblings has intensified the debate over two of the most stubborn questions in social science: What are the family dynamics that enhance intelligence? And can they — and should they — be changed? The new findings, from a landmark study published Friday, showed that eldest children had a slight but significant edge in I.Q. — an average of three points over the closest sibling. And it found that the difference was not because of biological factors but the psychological interplay of parents and children. Predictably, the study set off a swarm of Internet commentary from parents, social scientists and others, speculating about what in families could enrich one child’s intellectual environme...