By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline.

通过测量一束头发上较重的氢和氧同位素的比例，科学家可以构建一个地理时间轴。

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Contagious: a human head louse clings to a strand of hair.

感染力：附着在一根头发上的人类头虱。

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Sarah lifted her hand and started twirling a strand of hair.

萨拉抬起手来开始用手指缠绕一缕头发。

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Or how you can take a strand of hair and can get someone's whole drug history.

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It's the manipulation of manufactured materials measuring less than 100 nanometers, or a thousandth the width of a strand of hair.

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"The publicity wasn't so great, " says Langer, thoughtfully twisting and pulling at a stray strand of hair.

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