And that, report researchers from Harvard University and the University of Texas in the current issue of the journal Nature, is where evolution enters the story.

哈佛大学和德克萨斯大学研究员在当期《自然》杂志上发表报告，用进化解释了这一问题。

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But in 1938, Dr Arlie Bock, the director of the then Department of Hygiene at Harvard University, wondered whether studying sick people was only half of the story.

但是，在1938年，哈佛大学卫生系主任Arlie Bock博士怀疑，研究病人只是故事的一半。

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