A study of 240,000 Norwegian teenagers has found that first-born children are, on average, more than two I.Q. points more intelligent than the next kid in line.
A study of 240,000 Norwegian teenagers has found that first-born children are, on average, more than two I.Q. points more intelligent than the next kid in line.
一个针对24万名挪威年青人的研究发现：第一个出生的孩子平均要比弟弟或妹妹的I.Q.要高2个点。