这种重量上的差异要远远小于由充电或是擦拭屏幕灰尘引起的差异。

The difference in weight is far less than the difference produced by charging the battery, or wiping dust off the screen.

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研究小组严格控制了社会及文化因素引起的差异，以便单纯研究自然选择对这些特征的选择性到底有多强。

They controlled for changes due to social and cultural factors to calculate how strongly natural selection is shaping these traits.

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“尽管文化差异也会影响人类的繁衍，但隐藏在文化差异之下的生物学特性引起的差异仍然可被检测到，这一事实十分的有趣。” 斯特恩说。

"It's interesting that the underlying biological framework is still detectable beneath the culture," he says.

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The only important thing to realize about that is that these differences start to occur very early in development.

唯一需要引起重视的是,这些差异发生在,发育阶段的早期

耶鲁公开课 - 生物医学工程探索课程节选