This is the question at the heart of a study published in Nature by a group of researchers who work at deCODE, an Icelandic genomics company.

这也是发表在《自然》上的一篇文章所涉及的中心问题，文章作者是冰岛一家名为“DeCODE”的基因公司的研究人员。

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But more work will be needed to confirm the result, says Tony Dayan, an emeritus professor of toxicology, because the study was based on a small, distinctive group.

已退休的毒理学教授托尼达扬称，确认该研究成果还需付出更多努力，因为研究只是基于一个狭小，特殊的群体。

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In one study, for example, when students in a work group each estimated their contribution to the team, the total was 139 percent.

例如，一项研究中，当学生小组每个人估计自己对小组的贡献率时，合计达到139%。

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Of course, when class is out of session, students are expected to keep in contact, work on group projects and study together.

WSJ: Traveling the Globe -- Just to Get to Class

However, recent work by Mathematica, an independent policy group, suggests that the Credo study is sound.

ECONOMIST: Education: Charting a better course | The

"Regardless of this firm's expertise on purely technical matters unrelated to policy formation, Ecology and Environment's participation in a trade association and lobbying effort in support of authorizing high-volume hydraulic fracturing in New York fundamentally disqualifies the firm and its work" for the DEC environmental impact study, Russ Haven of the New York Public Interest Research Group said in a statement released Wednesday.

WSJ: NY groups claim industry bias in fracking study