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How would you feel if, after giving birth to your second child, the doctor handed him to you and said, "Congratulations, but watch out with this one because he's more likely than your firstborn to be a troublemaker"? 如果你刚生完第二胎，而医生把孩子递给你的时候却对你说："祝贺你，但你也要小心了，因为他可能比第一胎更淘气，"你会感受如何呢？ Well, that's pretty much the conclusion that researchers from a study led by MIT economist Joseph Doyle came to after poring over data from thousands of sets of brothers from Denmark and Florida. 麻省理工学院经济学家约瑟夫·多伊尔主领了一项研究，仔细研究来自丹麦和福罗里达成千上万名兄弟的数据，研究结果与上述内容相差无几。 It's true Denmark and Florida are quite different when it comes to raising kids, and yet Doyle and fellow researchers found that despite the differences in environments, there was something they had in common. 虽然丹麦和福罗里达在养育孩子方面存在很大差异，但多伊尔和其他研究员发现：尽管环境存在着差异，但他们之间也有共同点。 | 
