这就是最近加州大学戴维斯分校的乔纳森·埃辛及其同事所提出的问题。
That is the question asked recently by Jonathan Eisen of the University of California, Davis, and his colleagues.
就职于新南威尔士州大学的乔·弗格斯教授说，拜大脑的“信息处理加速功能”所赐，忧郁的人比快乐的人更能应付一些棘手的事情。
The University of New South Wales researcher says a grumpy person can cope with more demanding situations than a happy one because of the way the brain "promotes information processing strategies".
圣路易斯华盛顿大学的心理学家莱昂纳德和乔尔·迈尔森发现，给小费者人是否慷慨可能会受到帐单金额的影响。
Leonard Green and Joel Myerson, psychologists at Washington University in St. Louis, found the generosity of a tipper may be limited by their bill.
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