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People who show-off in public, taking wild risks they would never dream of taking when on their own, are driven to do so by their brain chemistry, a new study has shown. 据英国《每日邮报》9月7日报道，一项新研究发现，人脑中的化学物质能够刺激人在公众场合进行炫耀，并使他们做出一些疯狂的冒险举动。而这些冒险举动是他们在独处时绝对不可能做出的。 Researchers from the University of Southern California believe they have proved that nature, not nurture, is what drives some of us to take stupid chances in social situations. 美国南加州大学的研究人员业已证明，使一些人在社交活动中做出愚蠢冒险选择的是我们的本能，而非（后天）培养的。 | 
